what was the increase in free cash flow achieved during 2011?
Important information:
table_4: ( $ in millions except per share amounts ) the net earnings ( loss ) of year ended december 31 2011 is -94 ( 94 ) ; the net earnings ( loss ) of year ended december 31 2010 is 135 ; the net earnings ( loss ) of year ended december 31 2009 is 124 ; the net earnings ( loss ) of year ended december 31 2008 is -2420 ( 2420 ) ; the net earnings ( loss ) of year ended december 31 2007 is 276 ;
table_8: ( $ in millions except per share amounts ) the free cash flow ( 2 ) of year ended december 31 2011 is 331 ; the free cash flow ( 2 ) of year ended december 31 2010 is 168 ; the free cash flow ( 2 ) of year ended december 31 2009 is -269 ( 269 ) ; the free cash flow ( 2 ) of year ended december 31 2008 is 121 ; the free cash flow ( 2 ) of year ended december 31 2007 is 364 ;
table_10: ( $ in millions except per share amounts ) the diluted earnings ( loss ) per share of year ended december 31 2011 is $ -1.93 ( 1.93 ) ; the diluted earnings ( loss ) per share of year ended december 31 2010 is $ 2.77 ; the diluted earnings ( loss ) per share of year ended december 31 2009 is $ 2.54 ; the diluted earnings ( loss ) per share of year ended december 31 2008 is $ -49.61 ( 49.61 ) ; the diluted earnings ( loss ) per share of year ended december 31 2007 is $ 5.65 ;
Reasoning Steps:
Step: minus2-1(331, 168) = 163
Step: divide2-2(#0, 168) = 97%
Program:
subtract(331, 168), divide(#0, 168)
Program (Nested):
divide(subtract(331, 168), 168)

Please answer the following financial question based on the context provided. Make sure to give the answer in raw number, not in percentage and without any units. If the question asks for percentage the value should be less than 1
Context:
( 1 ) the cumulative total return assumes reinvestment of dividends . ( 2 ) the total return is weighted according to market capitalization of each company at the beginning of each year . ( f ) purchases of equity securities by the issuer and affiliated purchasers we have not repurchased any of our common stock since the company filed its initial registration statement on march 16 , ( g ) securities authorized for issuance under equity compensation plans a description of securities authorized for issuance under our equity compensation plans will be incorporated herein by reference to the proxy statement for the 2012 annual meeting of stockholders to be filed within 120 days after the end of the company 2019s fiscal year . item 6 . selected financial data .
Table
( $ in millions except per share amounts ) | year ended december 31 2011 | year ended december 31 2010 | year ended december 31 2009 | year ended december 31 2008 | year ended december 31 2007
sales and service revenues                 | $ 6575                      | $ 6723                      | $ 6292                      | $ 6189                      | $ 5692                     
goodwill impairment                        | 290                         | 0                           | 0                           | 2490                        | 0                          
operating income ( loss )                  | 110                         | 248                         | 211                         | -2354 ( 2354 )              | 447                        
net earnings ( loss )                      | -94 ( 94 )                  | 135                         | 124                         | -2420 ( 2420 )              | 276                        
total assets                               | 6001                        | 5203                        | 5036                        | 4760                        | 7658                       
long-term debt ( 1 )                       | 1830                        | 105                         | 283                         | 283                         | 283                        
total long-term obligations                | 3757                        | 1559                        | 1645                        | 1761                        | 1790                       
free cash flow ( 2 )                       | 331                         | 168                         | -269 ( 269 )                | 121                         | 364                        
basic earnings ( loss ) per share          | $ -1.93 ( 1.93 )            | $ 2.77                      | $ 2.54                      | $ -49.61 ( 49.61 )          | $ 5.65                     
diluted earnings ( loss ) per share        | $ -1.93 ( 1.93 )            | $ 2.77                      | $ 2.54                      | $ -49.61 ( 49.61 )          | $ 5.65                     
( 1 ) long-term debt does not include amounts payable to our former parent as of and before december 31 , 2010 , as these amounts were due upon demand and included in current liabilities . ( 2 ) free cash flow is a non-gaap financial measure and represents cash from operating activities less capital expenditures . see liquidity and capital resources in item 7 for more information on this measure. .
Question: 
what was the increase in free cash flow achieved during 2011?
Important information:
table_4: ( $ in millions except per share amounts ) the net earnings ( loss ) of year ended december 31 2011 is -94 ( 94 ) ; the net earnings ( loss ) of year ended december 31 2010 is 135 ; the net earnings ( loss ) of year ended december 31 2009 is 124 ; the net earnings ( loss ) of year ended december 31 2008 is -2420 ( 2420 ) ; the net earnings ( loss ) of year ended december 31 2007 is 276 ;
table_8: ( $ in millions except per share amounts ) the free cash flow ( 2 ) of year ended december 31 2011 is 331 ; the free cash flow ( 2 ) of year ended december 31 2010 is 168 ; the free cash flow ( 2 ) of year ended december 31 2009 is -269 ( 269 ) ; the free cash flow ( 2 ) of year ended december 31 2008 is 121 ; the free cash flow ( 2 ) of year ended december 31 2007 is 364 ;
table_10: ( $ in millions except per share amounts ) the diluted earnings ( loss ) per share of year ended december 31 2011 is $ -1.93 ( 1.93 ) ; the diluted earnings ( loss ) per share of year ended december 31 2010 is $ 2.77 ; the diluted earnings ( loss ) per share of year ended december 31 2009 is $ 2.54 ; the diluted earnings ( loss ) per share of year ended december 31 2008 is $ -49.61 ( 49.61 ) ; the diluted earnings ( loss ) per share of year ended december 31 2007 is $ 5.65 ;
Reasoning Steps:
Step: minus2-1(331, 168) = 163
Step: divide2-2(#0, 168) = 97%
Program:
subtract(331, 168), divide(#0, 168)
Program (Nested):
divide(subtract(331, 168), 168)
