2020 partial redemption of preferred units on february 12 , 2020 , we completed the redemption of 55,000 series a preferred units , representing 50 % of the then-outstanding series a preferred units . the series a preferred units were redeemed at a price of $ 1,110.72 per series a preferred unit for an aggregate redemption price of $ 61.1 million . acquisitions on april 17 , 2020 , we completed the springbok acquisition . the aggregate consideration for the springbok acquisition consisted of ( i ) approximately $ 95.0 million in cash , ( ii ) the issuance of 2,224,358 common units and ( iii ) the 81 issuance of 2,497,134 opco common units and an equal number of class b units . at the time of the springbok acquisition , the acreage acquired had over 90 operators on 2,160 net royalty acres across core areas of the delaware basin , dj basin , haynesville , stack , eagle ford and other leading basins . joint venture in connection with the joint venture ( the “ joint venture ” ) with springbok skr capital company , llc and rivercrest capital partners , lp , we paid capital contributions of $ 2.2 million during the year ended december 31 , 2020. interest rate swaps on january 27 , 2021 , we entered into an interest rate swap with citibank , n.a . ( “ citi ” ) , which fixed the interest rate on $ 150.0 million of notional , or approximately 87 % of our outstanding balance on our secured revolving credit facility , at approximately 3.9 % for a period ending on january 29 , 2024. fourth quarter distributions on february 3 , 2021 , we paid a quarterly cash distribution on the series a preferred units of $ 1.0 million for the quarter ended december 31 , 2020. on february 4 , 2021 , we paid a quarterly cash distribution to each class b unitholder equal to 2.0 % of such unitholder 's respective class b contribution , resulting in a total quarterly distribution of approximately $ 20,780 for the quarter ended december 31 , 2020. on january 22 , 2021 , the board of directors declared a quarterly cash distribution of $ 0.19 per common unit for the quarter ended december 31 , 2020. the distribution was paid on february 8 , 2021 to common unitholders and opco common unitholders of record as of the close of business on february 1 , 2021. business environment covid-19 pandemic and impact on global demand for oil and natural gas the global spread of covid-19 created significant volatility , uncertainty , and economic disruption during 2020. on march 11 , 2020 , the who declared the ongoing covid-19 outbreak a pandemic and recommended containment and mitigation measures worldwide . the pandemic has reached more than 200 countries and has resulted in widespread adverse impacts on the global economy , our oil , natural gas , and ngl operators and other parties with whom we have business relations , including a significant reduction in the global demand for oil and natural gas . this significant decline in demand accelerated following the announcement of price reductions and production increases in march 2020 by members of opec and other foreign , oil-exporting countries , raising concerns about global storage capacity . the resulting supply and demand imbalance has led to a significantly weaker outlook for oil and gas producers and continues to have a disruptive impact on the oil and natural gas industry . globally , these conditions led to significant economic contraction during 2020. our first priority in our response to this crisis has been and will continue to be the health and safety of our employees , the employees of our business counterparties and the community in which we operate . to address these concerns , we have modified certain business practices ( including those related to employee travel , employee work locations , and physical participation in meetings , events and conferences ) to conform to government restrictions and best practices encouraged by the cdc , the who and other governmental and regulatory authorities . in mid-march , we restricted access to our offices to only essential employees , and directed the remainder of our employees to work from home to the extent possible . beginning in mid-may , we opened our offices to employees on a voluntary basis , with employees having the option to work from home . these restrictions have had minimal impact on our operations to date and have allowed us to maintain the engagement and connectivity of our personnel , as well as minimize the number of employees in the office . there is considerable uncertainty regarding the extent to which covid-19 will continue to spread and the extent and duration of governmental and other measures implemented to try to slow the spread of the virus , such as large-scale travel bans and restrictions , border closures , quarantines , shelter-in-place orders and business and government shutdowns . 82 while shelter-in-place restrictions subsided in the second half of 2020 , the possibility of future restrictions remains . one of the largest impacts of the pandemic has been a significant reduction in global demand for oil and , to a lesser extent , natural gas . this significant decline in demand has been met with a sharp decline in oil prices which has been exacerbated by the announcement of price reductions and production increases in march 2020 by members of opec and other foreign , oil-exporting countries . although opec agreed in april 2020 to cut oil production and has extended such production cuts through march 2021 , crude oil prices remained depressed through december 31 , 2020 as a result of an increasingly utilized global storage network and the decrease in crude oil demand due to covid-19 . story_separator_special_tag costs associated with unevaluated properties are excluded from the full-cost pool until a determination as to the existence of proved reserves is able to be made . the inclusion of our unevaluated costs into the amortization base is expected to be completed within five years . marketing and other deductions marketing and other deductions include product marketing expense , which is a post-production expense . generally , the terms of the lease governing the development of our properties permit the operator to pass through these expenses to us by deducting a pro rata portion of such expenses from our production revenues . general and administrative expense general and administrative expenses are costs not directly associated with the production of oil , natural gas and ngls and include the cost of executives and employees and related benefits , office expenses and fees for professional services . we have entered into a management services agreement with kimbell operating , which in turn has entered into separate services agreements with entities controlled by affiliates of certain of our sponsors and certain contributing parties , pursuant to which they and kimbell operating provide management , administrative and operational services to us . in addition , under each of their respective services agreements , affiliates of our sponsors will identify , evaluate and recommend to us acquisition opportunities and negotiate the terms of such acquisitions . 87 interest expense we finance a portion of our capital requirements and acquisitions with borrowings under our secured revolving credit facility . as a result , we incur interest expense , which is included in our accompanying consolidated statements of operations . please read “ liquidity and capital resources—indebtedness ” for further discussion of our secured revolving credit facility . income tax expense on september 24 , 2018 , we elected to change our federal income tax status from that of a pass-through partnership to that of a taxable entity via a “ check the box ” election ( the “ tax election ” ) . as a result of the tax election , we are subject to federal income tax on our taxable income at the united states corporate tax rate , which is currently 21.0 % . texas imposes a franchise tax , commonly referred to as the texas margin tax , which is considered an income tax , at a rate of 0.75 % on gross revenues less certain deductions , as specifically set forth in the texas margin tax statute . a significant portion of our mineral and royalty interests are located in texas basins and producing regions . results of operations the table below summarizes our revenue and expenses and production data for the periods indicated . replace_table_token_18_th ​ 88 comparison of the year ended december 31 , 2020 to the year ended december 31 , 2019 and the year ended december 31 , 2019 to the year ended december 31 , 2018 oil , natural gas and ngl revenues for the year ended december 31 , 2020 , our oil , natural gas and ngl revenues were $ 92.6 million , a decrease of $ 14.9 million from $ 107.5 million for the year ended december 31 , 2019. the significant decrease in oil , natural gas and ngl revenues was directly related to the decrease in the average prices we received for oil , natural gas and ngl production for the year ended december 31 , 2020 as discussed below . this decrease was partially offset by an increase in production associated with various acquisitions throughout the 2019 and 2020 periods . our revenues for the year ended december 31 , 2019 increased by $ 41.8 million , from $ 65.7 million for the year ended december 31 , 2018. the increase in revenues was primarily attributable to the revenues associated with the haymaker acquisition and the phillips acquisition , which represented approximately $ 20.2 million and $ 16.3 million , respectively , of the overall increase in oil , natural gas and ngl revenues , and , to a lesser extent , the revenues associated with the dropdown , which contributed $ 11.1 million to the overall increase . partially offsetting the increase in oil , natural gas and ngl revenues , was a decrease in the average prices we received for oil and ngl production . our revenues are a function of oil , natural gas , and ngl production volumes sold and average prices received for those volumes . the production volumes were 5,072,635 boe or 13,860 boe/d , for the year ended december 31 , 2020 , an increase of 556,768 boe or 1,529 boe/d , from 4,515,867 boe or 12,331 boe/d , for the year ended december 31 , 2019. the increase in production for the year ended december 31 , 2020 was primarily attributable to production associated with the springbok acquisition , which accounted for 568,424 boe . our production volumes for the year ended december 31 , 2019 increased by 2,302,152 boe or 2,333 boe/d , from 2,213,715 boe or 9,998 boe/d , for the year ended december 31 , 2018. the increase in production was primarily attributable to the haymaker acquisition , which represented 1,341,075 boe , and to a lesser extent , production associated with the phillips acquisition and the dropdown , which together accounted for 968,102 boe . our operators received an average of $ 36.98 per bbl of oil , $ 1.79 per mcf of natural gas and $ 12.39 per bbl of ngl for the volumes sold during the year ended december 31 , 2020 and $ 54.66 per bbl of oil , $ 2.21 per mcf of natural gas and $ 15.96 per bbl of ngl for the volumes sold during the year ended december 31 , 2019. the year ended december 31 , 2020 decreased 32.3 % or $ 17.68 per bbl of oil and 19.0 % or $ 0.42 per mcf of natural gas compared to the

cash flows the following table presents our cash flows for the periods indicated . replace_table_token_19_th operating activities operating cash flow is impacted by many variables , the most significant of which are the changes in oil , natural gas and ngl production volumes due to acquisitions or other external factors and changes in prices for oil , natural gas and ngls . prices for these commodities are determined primarily by prevailing market conditions . regional and worldwide economic activity , weather and other substantially variable factors influence market conditions for these products . these factors are beyond our control and are difficult to predict . cash flows provided by operating activities for the year ended december 31 , 2020 were $ 62.2 million , a decrease of $ 18.5 million compared to $ 80.7 million for the year ended december 31 , 2019. the decrease in cash flows provided by operating activities was primarily attributable to the decrease in the average prices we received for oil , natural gas and ngl production for the year ended december 31 , 2020. cash flows provided by operating activities for the year ended december 31 , 2019 increased by $ 47.5 million compared to $ 33.2 million for the year ended december 31 , 2018. the increase in cash flows provided by operating activities was primarily attributable to the haymaker acquisition and dropdown in the third and fourth quarters of 2018 , respectively , and to the phillips acquisition and buckhorn acquisition in the first and fourth quarters of 2019 , respectively . investing activities cash flows used in investing activities for the year ended december 31 , 2020 increased by $ 75.2 million compared to the year ended december 31 , 2019. for the year ended december 31 , 2020 , we used $ 87.6 million primarily to fund the springbok acquisition , $ 2.2 million to fund the capital commitments of the joint venture and $ 1.0 million to fund the remodel of office space .


 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.
     ```cash flows the following table presents our cash flows for the periods indicated . replace_table_token_19_th operating activities operating cash flow is impacted by many variables , the most significant of which are the changes in oil , natural gas and ngl production volumes due to acquisitions or other external factors and changes in prices for oil , natural gas and ngls . prices for these commodities are determined primarily by prevailing market conditions . regional and worldwide economic activity , weather and other substantially variable factors influence market conditions for these products . these factors are beyond our control and are difficult to predict . cash flows provided by operating activities for the year ended december 31 , 2020 were $ 62.2 million , a decrease of $ 18.5 million compared to $ 80.7 million for the year ended december 31 , 2019. the decrease in cash flows provided by operating activities was primarily attributable to the decrease in the average prices we received for oil , natural gas and ngl production for the year ended december 31 , 2020. cash flows provided by operating activities for the year ended december 31 , 2019 increased by $ 47.5 million compared to $ 33.2 million for the year ended december 31 , 2018. the increase in cash flows provided by operating activities was primarily attributable to the haymaker acquisition and dropdown in the third and fourth quarters of 2018 , respectively , and to the phillips acquisition and buckhorn acquisition in the first and fourth quarters of 2019 , respectively . investing activities cash flows used in investing activities for the year ended december 31 , 2020 increased by $ 75.2 million compared to the year ended december 31 , 2019. for the year ended december 31 , 2020 , we used $ 87.6 million primarily to fund the springbok acquisition , $ 2.2 million to fund the capital commitments of the joint venture and $ 1.0 million to fund the remodel of office space .
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 Suspicious Activity Report : 2020 partial redemption of preferred units on february 12 , 2020 , we completed the redemption of 55,000 series a preferred units , representing 50 % of the then-outstanding series a preferred units . the series a preferred units were redeemed at a price of $ 1,110.72 per series a preferred unit for an aggregate redemption price of $ 61.1 million . acquisitions on april 17 , 2020 , we completed the springbok acquisition . the aggregate consideration for the springbok acquisition consisted of ( i ) approximately $ 95.0 million in cash , ( ii ) the issuance of 2,224,358 common units and ( iii ) the 81 issuance of 2,497,134 opco common units and an equal number of class b units . at the time of the springbok acquisition , the acreage acquired had over 90 operators on 2,160 net royalty acres across core areas of the delaware basin , dj basin , haynesville , stack , eagle ford and other leading basins . joint venture in connection with the joint venture ( the “ joint venture ” ) with springbok skr capital company , llc and rivercrest capital partners , lp , we paid capital contributions of $ 2.2 million during the year ended december 31 , 2020. interest rate swaps on january 27 , 2021 , we entered into an interest rate swap with citibank , n.a . ( “ citi ” ) , which fixed the interest rate on $ 150.0 million of notional , or approximately 87 % of our outstanding balance on our secured revolving credit facility , at approximately 3.9 % for a period ending on january 29 , 2024. fourth quarter distributions on february 3 , 2021 , we paid a quarterly cash distribution on the series a preferred units of $ 1.0 million for the quarter ended december 31 , 2020. on february 4 , 2021 , we paid a quarterly cash distribution to each class b unitholder equal to 2.0 % of such unitholder 's respective class b contribution , resulting in a total quarterly distribution of approximately $ 20,780 for the quarter ended december 31 , 2020. on january 22 , 2021 , the board of directors declared a quarterly cash distribution of $ 0.19 per common unit for the quarter ended december 31 , 2020. the distribution was paid on february 8 , 2021 to common unitholders and opco common unitholders of record as of the close of business on february 1 , 2021. business environment covid-19 pandemic and impact on global demand for oil and natural gas the global spread of covid-19 created significant volatility , uncertainty , and economic disruption during 2020. on march 11 , 2020 , the who declared the ongoing covid-19 outbreak a pandemic and recommended containment and mitigation measures worldwide . the pandemic has reached more than 200 countries and has resulted in widespread adverse impacts on the global economy , our oil , natural gas , and ngl operators and other parties with whom we have business relations , including a significant reduction in the global demand for oil and natural gas . this significant decline in demand accelerated following the announcement of price reductions and production increases in march 2020 by members of opec and other foreign , oil-exporting countries , raising concerns about global storage capacity . the resulting supply and demand imbalance has led to a significantly weaker outlook for oil and gas producers and continues to have a disruptive impact on the oil and natural gas industry . globally , these conditions led to significant economic contraction during 2020. our first priority in our response to this crisis has been and will continue to be the health and safety of our employees , the employees of our business counterparties and the community in which we operate . to address these concerns , we have modified certain business practices ( including those related to employee travel , employee work locations , and physical participation in meetings , events and conferences ) to conform to government restrictions and best practices encouraged by the cdc , the who and other governmental and regulatory authorities . in mid-march , we restricted access to our offices to only essential employees , and directed the remainder of our employees to work from home to the extent possible . beginning in mid-may , we opened our offices to employees on a voluntary basis , with employees having the option to work from home . these restrictions have had minimal impact on our operations to date and have allowed us to maintain the engagement and connectivity of our personnel , as well as minimize the number of employees in the office . there is considerable uncertainty regarding the extent to which covid-19 will continue to spread and the extent and duration of governmental and other measures implemented to try to slow the spread of the virus , such as large-scale travel bans and restrictions , border closures , quarantines , shelter-in-place orders and business and government shutdowns . 82 while shelter-in-place restrictions subsided in the second half of 2020 , the possibility of future restrictions remains . one of the largest impacts of the pandemic has been a significant reduction in global demand for oil and , to a lesser extent , natural gas . this significant decline in demand has been met with a sharp decline in oil prices which has been exacerbated by the announcement of price reductions and production increases in march 2020 by members of opec and other foreign , oil-exporting countries . although opec agreed in april 2020 to cut oil production and has extended such production cuts through march 2021 , crude oil prices remained depressed through december 31 , 2020 as a result of an increasingly utilized global storage network and the decrease in crude oil demand due to covid-19 . story_separator_special_tag costs associated with unevaluated properties are excluded from the full-cost pool until a determination as to the existence of proved reserves is able to be made . the inclusion of our unevaluated costs into the amortization base is expected to be completed within five years . marketing and other deductions marketing and other deductions include product marketing expense , which is a post-production expense . generally , the terms of the lease governing the development of our properties permit the operator to pass through these expenses to us by deducting a pro rata portion of such expenses from our production revenues . general and administrative expense general and administrative expenses are costs not directly associated with the production of oil , natural gas and ngls and include the cost of executives and employees and related benefits , office expenses and fees for professional services . we have entered into a management services agreement with kimbell operating , which in turn has entered into separate services agreements with entities controlled by affiliates of certain of our sponsors and certain contributing parties , pursuant to which they and kimbell operating provide management , administrative and operational services to us . in addition , under each of their respective services agreements , affiliates of our sponsors will identify , evaluate and recommend to us acquisition opportunities and negotiate the terms of such acquisitions . 87 interest expense we finance a portion of our capital requirements and acquisitions with borrowings under our secured revolving credit facility . as a result , we incur interest expense , which is included in our accompanying consolidated statements of operations . please read “ liquidity and capital resources—indebtedness ” for further discussion of our secured revolving credit facility . income tax expense on september 24 , 2018 , we elected to change our federal income tax status from that of a pass-through partnership to that of a taxable entity via a “ check the box ” election ( the “ tax election ” ) . as a result of the tax election , we are subject to federal income tax on our taxable income at the united states corporate tax rate , which is currently 21.0 % . texas imposes a franchise tax , commonly referred to as the texas margin tax , which is considered an income tax , at a rate of 0.75 % on gross revenues less certain deductions , as specifically set forth in the texas margin tax statute . a significant portion of our mineral and royalty interests are located in texas basins and producing regions . results of operations the table below summarizes our revenue and expenses and production data for the periods indicated . replace_table_token_18_th ​ 88 comparison of the year ended december 31 , 2020 to the year ended december 31 , 2019 and the year ended december 31 , 2019 to the year ended december 31 , 2018 oil , natural gas and ngl revenues for the year ended december 31 , 2020 , our oil , natural gas and ngl revenues were $ 92.6 million , a decrease of $ 14.9 million from $ 107.5 million for the year ended december 31 , 2019. the significant decrease in oil , natural gas and ngl revenues was directly related to the decrease in the average prices we received for oil , natural gas and ngl production for the year ended december 31 , 2020 as discussed below . this decrease was partially offset by an increase in production associated with various acquisitions throughout the 2019 and 2020 periods . our revenues for the year ended december 31 , 2019 increased by $ 41.8 million , from $ 65.7 million for the year ended december 31 , 2018. the increase in revenues was primarily attributable to the revenues associated with the haymaker acquisition and the phillips acquisition , which represented approximately $ 20.2 million and $ 16.3 million , respectively , of the overall increase in oil , natural gas and ngl revenues , and , to a lesser extent , the revenues associated with the dropdown , which contributed $ 11.1 million to the overall increase . partially offsetting the increase in oil , natural gas and ngl revenues , was a decrease in the average prices we received for oil and ngl production . our revenues are a function of oil , natural gas , and ngl production volumes sold and average prices received for those volumes . the production volumes were 5,072,635 boe or 13,860 boe/d , for the year ended december 31 , 2020 , an increase of 556,768 boe or 1,529 boe/d , from 4,515,867 boe or 12,331 boe/d , for the year ended december 31 , 2019. the increase in production for the year ended december 31 , 2020 was primarily attributable to production associated with the springbok acquisition , which accounted for 568,424 boe . our production volumes for the year ended december 31 , 2019 increased by 2,302,152 boe or 2,333 boe/d , from 2,213,715 boe or 9,998 boe/d , for the year ended december 31 , 2018. the increase in production was primarily attributable to the haymaker acquisition , which represented 1,341,075 boe , and to a lesser extent , production associated with the phillips acquisition and the dropdown , which together accounted for 968,102 boe . our operators received an average of $ 36.98 per bbl of oil , $ 1.79 per mcf of natural gas and $ 12.39 per bbl of ngl for the volumes sold during the year ended december 31 , 2020 and $ 54.66 per bbl of oil , $ 2.21 per mcf of natural gas and $ 15.96 per bbl of ngl for the volumes sold during the year ended december 31 , 2019. the year ended december 31 , 2020 decreased 32.3 % or $ 17.68 per bbl of oil and 19.0 % or $ 0.42 per mcf of natural gas compared to the

