if we do not offset lost committed revenues in this manner , our overall revenues will decrease . our unit prices offered to some customers have declined as a result of increased competition . these price reductions primarily impacted customers for which we deliver high volumes of traffic over our network , such as digital media customers . if we continue to experience decreases in unit prices and are unable to offset such reductions with increased traffic , enhanced efficiencies in our network , lower co-location and bandwidth expenses , or increased sales of incremental services to existing customers , our revenues and profit margins could decrease . during 2011 , we experienced a moderation in the rate of traffic growth in our video and software download solutions as compared prior periods . if this trend continues , our ability to generate revenue growth could be adversely impacted . historically , we have experienced seasonal variations of higher revenues in the fourth quarter of the year and lower revenues during the summer months . we primarily attribute such variations to patterns of usage of e-commerce services by our retail customers . if this trend continues , our ability to generate quarterly revenue growth on a sequential basis could be impacted . during 2011 , revenues derived from customers outside the united states accounted for 29 % of our total revenues . for 2012 , we anticipate revenues from such customers as a percentage of our total revenues to be consistent with 2011. costs and expenses during 2011 , we continued to reduce our network bandwidth costs per unit and to invest in internal-use software development to improve the performance and efficiency of our network . our total bandwidth costs increased in 2011 as compared to 2010 due to traffic growth on our network . we believe that our overall bandwidth costs will continue to increase as a result of expected higher traffic levels , partially offset by anticipated continued reductions in bandwidth costs per unit . if we do not experience lower per unit bandwidth pricing or we are unsuccessful at effectively routing traffic over our network through lower cost providers , total network bandwidth costs could increase more than expected in 2012. in 2011 , co-location costs increased and became a higher percentage of total cost of revenues due to continued expansion of our network . by improving our internal-use software to enable us to use servers more efficiently , we believe we can manage the growth of co-location costs by deploying fewer servers . if we are unable to achieve such cost reductions , our profitability will be negatively impacted . depreciation and amortization expense related to our network equipment and internal-use software development costs increased by $ 23.5 million during 2011 as compared to 2010. due to expected future purchases of network equipment during 2012 , we believe that depreciation expense related to our network equipment will continue to increase in 2012. we expect to continue to enhance and add functionality to our service offerings , which would increase capitalized stock-based compensation expense attributable to employees working on such projects . as a result , we believe that the amortization of internal-use software development costs , which we include in cost of revenues , will be higher in 2012 as compared to 2011. all of these increased costs could negatively affect our profitability . we expect to continue to grant restricted stock units , or rsus , to employees in the future ; therefore , we anticipate that stock-based compensation expense will increase . as of december 31 , 2011 , our total unrecognized compensation costs for stock-based awards were $ 110.9 million , which we expect to recognize as expense over a weighted average period of 1.3 years . this expense is expected to be recognized through 2015. for fiscal 2011 , our effective income tax rate was 34.6 % . we expect our annual effective income tax rate in 2012 to increase due to the expiration of the federal research and development credit at the end of 2011 , as well as the change in mix of income in various jurisdictions ; this expectation does not take into consideration the effect of discrete items recorded as a result of our compliance with the accounting guidance for stock-based compensation , any tax planning strategies or the effect of changes in tax laws and regulations . based on our analysis of , among other things , the aforementioned trends and events , as of the date of this annual report on form 10-k , we expect to continue to generate net income on a quarterly and annual basis during 2012 ; however , our future results are likely to be affected by many factors identified in the section captioned “ risk factors ” and elsewhere in this annual report on form 10-k , including our ability to : 21 increase our revenue by adding customers through recurring revenue contracts and limiting customer cancellations and terminations ; offset unit price declines for our services with higher volumes of traffic delivered on our network as well as increased sales of our value-added solutions ; prevent disruptions to our services and network due to accidents or intentional attacks ; and maintain our network bandwidth costs and other operating expenses consistent with our revenues . as a result , there is no assurance that we will achieve our expected financial objectives , including generating positive net income , in any future period . application of critical accounting policies and estimates overview our md & a is based upon our consolidated financial statements , which have been prepared in accordance with accounting principles generally accepted in the united states of america , or gaap . these principles require us to make estimates and judgments that affect the reported amounts of assets , liabilities , revenues and expenses , cash flow and related disclosure of contingent assets and liabilities . story_separator_special_tag capitalized internal-use software costs : we capitalize the salaries and payroll-related costs , as well as stock-based compensation expense , of employees and consultants who devote time to the development of internal-use software projects . if a project constitutes an enhancement to previously-developed software , we assess whether the enhancement is significant and creates additional functionality to the software , thus qualifying the work incurred for capitalization . once the project is complete , we estimate the useful life of the internal-use software , and we periodically assess whether the software is impaired . changes in our estimates related to internal-use software would increase or decrease operating expenses or amortization recorded during the period . results of operations revenues . total revenues increased 13 % , or $ 135.0 million , to $ 1,158.5 million for the year ended december 31 , 2011 as compared to $ 1,023.6 million for the year ended december 31 , 2010 . total revenues increased 19 % , or $ 163.8 million , to $ 1,023.6 million for the year ended december 31 , 2010 as compared to $ 859.8 million for the year ended december 31 , 2009 . the following table quantifies the increase in revenues attributable to the different industry verticals in which we sell our services ( in millions ) : replace_table_token_4_th we believe that the continued growth in use of the internet by businesses and consumers was the principal factor driving increased purchases of our services during each of the last several years . we expect this trend to continue in 2012 but at lower rates of growth due to general economic conditions and competitive factors . the increase in revenues for 2011 as compared to 2010 , as well as 2010 as compared to 2009 , was driven by increased revenues from our media and entertainment vertical due to traffic growth , partially offset by reduced prices charged to our customers . revenues from our commerce and enterprise verticals increased due to growth in application and cloud performance solutions sold to customers in these verticals . revenues from our high tech vertical in 2011 as compared to 2010 remained relatively flat as increased demand for application and cloud performance solutions offset the decline in software download revenues . the increase in revenues from our high tech vertical in 2010 as compared to 2009 , was due to an increase in traffic growth as well as an increase in demand for our application and cloud performance solution services . our 2011 revenues from the public sector vertical did not materially change as compared to 2010. the increase in 2010 revenues from public sector customers as compared to 2009 was primarily attributable to the addition of new customers and government contracts . for 2011 , 2010 and 2009 , 29 % , 28 % and 28 % , respectively , of our total revenues were derived from our operations located outside of the united states . revenue from our operations in europe represented 18 % , 17 % and 18 % of total revenues for 2011 , 25 2010 and 2009 , respectively . other than the united states , no single country accounted for 10 % or more of our total revenues during these periods . we expect international sales as a percentage of our total sales in 2012 to remain consistent as compared to 2011. resellers accounted for 19 % of total revenues in 2011 , 18 % in 2010 and 18 % in 2009 . for 2011 , 2010 and 2009 , no single customer accounted for 10 % or more of total revenues . cost of revenues . cost of revenues includes fees paid to network providers for bandwidth and co-location of our network equipment . cost of revenues also includes payroll and related costs and stock-based compensation expense for network operations personnel , cost of software licenses , depreciation of network equipment used to deliver our services and amortization of internal-use software . cost of revenues was comprised of the following ( in millions ) : replace_table_token_5_th cost of revenues increased 23 % , or $ 71.1 million , to $ 374.5 million for the year ended december 31 , 2011 as compared to $ 303.4 million for the year ended december 31 , 2010 . cost of revenues increased 21 % , or $ 53.5 million , to $ 303.4 million for the year ended december 31 , 2010 as compared to $ 249.9 million for the year ended december 31 , 2009 . in each instance , these increases were primarily due to an increase in the amounts paid to network providers due to higher traffic levels , partially offset by reduced bandwidth costs per unit , an increase in co-location costs as we deployed more servers , and increases in depreciation expense of network equipment and amortization of internal-use software as we continued to invest in our infrastructure . additionally , in each of 2011 , 2010 and 2009 , cost of revenues included stock-based compensation expense and amortization of capitalized stock-based compensation ; such expense decreased by $ 0.7 million in 2011 as compared to 2010 and increased by $ 1.7 million in 2010 as compared to 2009. cost of revenues during each of 2011 , 2010 and 2009 also included credits received of approximately $ 6.9 million , $ 7.1 million and $ 3.5 million , respectively , from settlements and renegotiations entered into in connection with billing disputes related to bandwidth contracts . credits of this nature may occur in the future ; however , the timing and amount of future credits , if any , are unpredictable . we have long-term purchase commitments for bandwidth usage and co-location with various networks and internet service providers . as of december 31 , 2011 , our current minimum commitments for the years ending december 31 , 2012 , 2013 , 2014 and 2015 were approximately $ 88.8 million , $

. net cash used in investing activities was $ 357.5 million for the year ended december 31 , 2009 . during 2011 , we had a significant increase in cash provided by investing activities due to investments maturing in which we did not reinvest in short- and long-term marketable securities . cash provided by investing activities for 2011 reflects proceeds from sales and redemptions of short- and long-term marketable securities of $ 701.3 million , proceeds from maturities of short- and long-term marketable securities of $ 532.9 million , proceeds from the sale of property and equipment of $ 0.2 million and a decrease in cash investments held for security deposits of $ 0.3 million . this was offset in part by purchases of short- and long-term marketable securities of $ 880.1 million , purchases of property and equipment of $ 182.9 million , including the capitalization of internal-use software development costs and earn out payments for the acquisition of substantially all of the assets of velocitude of $ 0.6 million . cash used in investing activities for 2010 reflects purchases of short- and long-term marketable securities of $ 1,146.5 million , purchases of property and equipment of $ 192.0 million , including the capitalization of internal-use software development costs , cash paid for the acquisition of substantially all of the assets of velocitude of $ 12.7 million , and an increase in other investments of $ 0.5 million . amounts attributable to these purchases and investments were offset , in part , by proceeds from sales and maturities of short- and long-term marketable securities of $ 1,015.8 million .


 Write a concise suspicious activity report of the following text delimited by triple backquotes. Return your response as a formal report which covers the key points highlighting the location,dates,entity names and account holder information in chronological order of the text.
     ```. net cash used in investing activities was $ 357.5 million for the year ended december 31 , 2009 . during 2011 , we had a significant increase in cash provided by investing activities due to investments maturing in which we did not reinvest in short- and long-term marketable securities . cash provided by investing activities for 2011 reflects proceeds from sales and redemptions of short- and long-term marketable securities of $ 701.3 million , proceeds from maturities of short- and long-term marketable securities of $ 532.9 million , proceeds from the sale of property and equipment of $ 0.2 million and a decrease in cash investments held for security deposits of $ 0.3 million . this was offset in part by purchases of short- and long-term marketable securities of $ 880.1 million , purchases of property and equipment of $ 182.9 million , including the capitalization of internal-use software development costs and earn out payments for the acquisition of substantially all of the assets of velocitude of $ 0.6 million . cash used in investing activities for 2010 reflects purchases of short- and long-term marketable securities of $ 1,146.5 million , purchases of property and equipment of $ 192.0 million , including the capitalization of internal-use software development costs , cash paid for the acquisition of substantially all of the assets of velocitude of $ 12.7 million , and an increase in other investments of $ 0.5 million . amounts attributable to these purchases and investments were offset , in part , by proceeds from sales and maturities of short- and long-term marketable securities of $ 1,015.8 million .
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 Suspicious Activity Report : if we do not offset lost committed revenues in this manner , our overall revenues will decrease . our unit prices offered to some customers have declined as a result of increased competition . these price reductions primarily impacted customers for which we deliver high volumes of traffic over our network , such as digital media customers . if we continue to experience decreases in unit prices and are unable to offset such reductions with increased traffic , enhanced efficiencies in our network , lower co-location and bandwidth expenses , or increased sales of incremental services to existing customers , our revenues and profit margins could decrease . during 2011 , we experienced a moderation in the rate of traffic growth in our video and software download solutions as compared prior periods . if this trend continues , our ability to generate revenue growth could be adversely impacted . historically , we have experienced seasonal variations of higher revenues in the fourth quarter of the year and lower revenues during the summer months . we primarily attribute such variations to patterns of usage of e-commerce services by our retail customers . if this trend continues , our ability to generate quarterly revenue growth on a sequential basis could be impacted . during 2011 , revenues derived from customers outside the united states accounted for 29 % of our total revenues . for 2012 , we anticipate revenues from such customers as a percentage of our total revenues to be consistent with 2011. costs and expenses during 2011 , we continued to reduce our network bandwidth costs per unit and to invest in internal-use software development to improve the performance and efficiency of our network . our total bandwidth costs increased in 2011 as compared to 2010 due to traffic growth on our network . we believe that our overall bandwidth costs will continue to increase as a result of expected higher traffic levels , partially offset by anticipated continued reductions in bandwidth costs per unit . if we do not experience lower per unit bandwidth pricing or we are unsuccessful at effectively routing traffic over our network through lower cost providers , total network bandwidth costs could increase more than expected in 2012. in 2011 , co-location costs increased and became a higher percentage of total cost of revenues due to continued expansion of our network . by improving our internal-use software to enable us to use servers more efficiently , we believe we can manage the growth of co-location costs by deploying fewer servers . if we are unable to achieve such cost reductions , our profitability will be negatively impacted . depreciation and amortization expense related to our network equipment and internal-use software development costs increased by $ 23.5 million during 2011 as compared to 2010. due to expected future purchases of network equipment during 2012 , we believe that depreciation expense related to our network equipment will continue to increase in 2012. we expect to continue to enhance and add functionality to our service offerings , which would increase capitalized stock-based compensation expense attributable to employees working on such projects . as a result , we believe that the amortization of internal-use software development costs , which we include in cost of revenues , will be higher in 2012 as compared to 2011. all of these increased costs could negatively affect our profitability . we expect to continue to grant restricted stock units , or rsus , to employees in the future ; therefore , we anticipate that stock-based compensation expense will increase . as of december 31 , 2011 , our total unrecognized compensation costs for stock-based awards were $ 110.9 million , which we expect to recognize as expense over a weighted average period of 1.3 years . this expense is expected to be recognized through 2015. for fiscal 2011 , our effective income tax rate was 34.6 % . we expect our annual effective income tax rate in 2012 to increase due to the expiration of the federal research and development credit at the end of 2011 , as well as the change in mix of income in various jurisdictions ; this expectation does not take into consideration the effect of discrete items recorded as a result of our compliance with the accounting guidance for stock-based compensation , any tax planning strategies or the effect of changes in tax laws and regulations . based on our analysis of , among other things , the aforementioned trends and events , as of the date of this annual report on form 10-k , we expect to continue to generate net income on a quarterly and annual basis during 2012 ; however , our future results are likely to be affected by many factors identified in the section captioned “ risk factors ” and elsewhere in this annual report on form 10-k , including our ability to : 21 increase our revenue by adding customers through recurring revenue contracts and limiting customer cancellations and terminations ; offset unit price declines for our services with higher volumes of traffic delivered on our network as well as increased sales of our value-added solutions ; prevent disruptions to our services and network due to accidents or intentional attacks ; and maintain our network bandwidth costs and other operating expenses consistent with our revenues . as a result , there is no assurance that we will achieve our expected financial objectives , including generating positive net income , in any future period . application of critical accounting policies and estimates overview our md & a is based upon our consolidated financial statements , which have been prepared in accordance with accounting principles generally accepted in the united states of america , or gaap . these principles require us to make estimates and judgments that affect the reported amounts of assets , liabilities , revenues and expenses , cash flow and related disclosure of contingent assets and liabilities . story_separator_special_tag capitalized internal-use software costs : we capitalize the salaries and payroll-related costs , as well as stock-based compensation expense , of employees and consultants who devote time to the development of internal-use software projects . if a project constitutes an enhancement to previously-developed software , we assess whether the enhancement is significant and creates additional functionality to the software , thus qualifying the work incurred for capitalization . once the project is complete , we estimate the useful life of the internal-use software , and we periodically assess whether the software is impaired . changes in our estimates related to internal-use software would increase or decrease operating expenses or amortization recorded during the period . results of operations revenues . total revenues increased 13 % , or $ 135.0 million , to $ 1,158.5 million for the year ended december 31 , 2011 as compared to $ 1,023.6 million for the year ended december 31 , 2010 . total revenues increased 19 % , or $ 163.8 million , to $ 1,023.6 million for the year ended december 31 , 2010 as compared to $ 859.8 million for the year ended december 31 , 2009 . the following table quantifies the increase in revenues attributable to the different industry verticals in which we sell our services ( in millions ) : replace_table_token_4_th we believe that the continued growth in use of the internet by businesses and consumers was the principal factor driving increased purchases of our services during each of the last several years . we expect this trend to continue in 2012 but at lower rates of growth due to general economic conditions and competitive factors . the increase in revenues for 2011 as compared to 2010 , as well as 2010 as compared to 2009 , was driven by increased revenues from our media and entertainment vertical due to traffic growth , partially offset by reduced prices charged to our customers . revenues from our commerce and enterprise verticals increased due to growth in application and cloud performance solutions sold to customers in these verticals . revenues from our high tech vertical in 2011 as compared to 2010 remained relatively flat as increased demand for application and cloud performance solutions offset the decline in software download revenues . the increase in revenues from our high tech vertical in 2010 as compared to 2009 , was due to an increase in traffic growth as well as an increase in demand for our application and cloud performance solution services . our 2011 revenues from the public sector vertical did not materially change as compared to 2010. the increase in 2010 revenues from public sector customers as compared to 2009 was primarily attributable to the addition of new customers and government contracts . for 2011 , 2010 and 2009 , 29 % , 28 % and 28 % , respectively , of our total revenues were derived from our operations located outside of the united states . revenue from our operations in europe represented 18 % , 17 % and 18 % of total revenues for 2011 , 25 2010 and 2009 , respectively . other than the united states , no single country accounted for 10 % or more of our total revenues during these periods . we expect international sales as a percentage of our total sales in 2012 to remain consistent as compared to 2011. resellers accounted for 19 % of total revenues in 2011 , 18 % in 2010 and 18 % in 2009 . for 2011 , 2010 and 2009 , no single customer accounted for 10 % or more of total revenues . cost of revenues . cost of revenues includes fees paid to network providers for bandwidth and co-location of our network equipment . cost of revenues also includes payroll and related costs and stock-based compensation expense for network operations personnel , cost of software licenses , depreciation of network equipment used to deliver our services and amortization of internal-use software . cost of revenues was comprised of the following ( in millions ) : replace_table_token_5_th cost of revenues increased 23 % , or $ 71.1 million , to $ 374.5 million for the year ended december 31 , 2011 as compared to $ 303.4 million for the year ended december 31 , 2010 . cost of revenues increased 21 % , or $ 53.5 million , to $ 303.4 million for the year ended december 31 , 2010 as compared to $ 249.9 million for the year ended december 31 , 2009 . in each instance , these increases were primarily due to an increase in the amounts paid to network providers due to higher traffic levels , partially offset by reduced bandwidth costs per unit , an increase in co-location costs as we deployed more servers , and increases in depreciation expense of network equipment and amortization of internal-use software as we continued to invest in our infrastructure . additionally , in each of 2011 , 2010 and 2009 , cost of revenues included stock-based compensation expense and amortization of capitalized stock-based compensation ; such expense decreased by $ 0.7 million in 2011 as compared to 2010 and increased by $ 1.7 million in 2010 as compared to 2009. cost of revenues during each of 2011 , 2010 and 2009 also included credits received of approximately $ 6.9 million , $ 7.1 million and $ 3.5 million , respectively , from settlements and renegotiations entered into in connection with billing disputes related to bandwidth contracts . credits of this nature may occur in the future ; however , the timing and amount of future credits , if any , are unpredictable . we have long-term purchase commitments for bandwidth usage and co-location with various networks and internet service providers . as of december 31 , 2011 , our current minimum commitments for the years ending december 31 , 2012 , 2013 , 2014 and 2015 were approximately $ 88.8 million , $

