supplementary information on oil and gas producing activities ( unaudited ) c o n t i n u e d summary of changes in standardized measure of discounted future net cash flows relating to proved oil and gas reserves ( in millions ) 2007 2006 2005 sales and transfers of oil and gas produced , net of production , transportation and administrative costs $ ( 4887 ) $ ( 5312 ) $ ( 3754 ) net changes in prices and production , transportation and administrative costs related to future production 12845 ( 1342 ) 6648 . ( in millions )                                                                                           | 2007             | 2006             | 2005            
sales and transfers of oil and gas produced net of production transportation and administrative costs     | $ -4887 ( 4887 ) | $ -5312 ( 5312 ) | $ -3754 ( 3754 )
net changes in prices and production transportation and administrative costs related to future production | 12845            | -1342 ( 1342 )   | 6648            
extensions discoveries and improved recovery less related costs                                           | 1816             | 1290             | 700             
development costs incurred during the period                                                              | 1654             | 1251             | 1030            
changes in estimated future development costs                                                             | -1727 ( 1727 )   | -527 ( 527 )     | -552 ( 552 )    
revisions of previous quantity estimates                                                                  | 290              | 1319             | 820             
net changes in purchases and sales of minerals in place                                                   | 23               | 30               | 4557            
accretion of discount                                                                                     | 1726             | 1882             | 1124            
net change in income taxes                                                                                | -6751 ( 6751 )   | -660 ( 660 )     | -6694 ( 6694 )  
timing and other                                                                                          | -12 ( 12 )       | -14 ( 14 )       | 307             
net change for the year                                                                                   | 4977             | -2083 ( 2083 )   | 4186            
beginning of year                                                                                         | 8518             | 10601            | 6415            
end of year                                                                                               | $ 13495          | $ 8518           | $ 10601         
net change for the year from discontinued operations                                                      | $ 2013           | $ -216 ( 216 )   | $ 162            .
Question: what was the net change in development costs from 2006 to 2007?

Read the following texts and table with financial data from an S&P 500 earnings report carefully.Based on the question-answer history (if provided), answer the last question. The answer may require mathematical calculation based on the data provided.
supplementary information on oil and gas producing activities ( unaudited ) c o n t i n u e d summary of changes in standardized measure of discounted future net cash flows relating to proved oil and gas reserves ( in millions ) 2007 2006 2005 sales and transfers of oil and gas produced , net of production , transportation and administrative costs $ ( 4887 ) $ ( 5312 ) $ ( 3754 ) net changes in prices and production , transportation and administrative costs related to future production 12845 ( 1342 ) 6648 . ( in millions )                                                                                           | 2007             | 2006             | 2005            
sales and transfers of oil and gas produced net of production transportation and administrative costs     | $ -4887 ( 4887 ) | $ -5312 ( 5312 ) | $ -3754 ( 3754 )
net changes in prices and production transportation and administrative costs related to future production | 12845            | -1342 ( 1342 )   | 6648            
extensions discoveries and improved recovery less related costs                                           | 1816             | 1290             | 700             
development costs incurred during the period                                                              | 1654             | 1251             | 1030            
changes in estimated future development costs                                                             | -1727 ( 1727 )   | -527 ( 527 )     | -552 ( 552 )    
revisions of previous quantity estimates                                                                  | 290              | 1319             | 820             
net changes in purchases and sales of minerals in place                                                   | 23               | 30               | 4557            
accretion of discount                                                                                     | 1726             | 1882             | 1124            
net change in income taxes                                                                                | -6751 ( 6751 )   | -660 ( 660 )     | -6694 ( 6694 )  
timing and other                                                                                          | -12 ( 12 )       | -14 ( 14 )       | 307             
net change for the year                                                                                   | 4977             | -2083 ( 2083 )   | 4186            
beginning of year                                                                                         | 8518             | 10601            | 6415            
end of year                                                                                               | $ 13495          | $ 8518           | $ 10601         
net change for the year from discontinued operations                                                      | $ 2013           | $ -216 ( 216 )   | $ 162            .
Question: what was the net change in development costs from 2006 to 2007?
