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 ) 2006 2005 2004 sales and transfers of oil and gas produced , net of production , transportation and administrative costs $ ( 5312 ) $ ( 3754 ) $ ( 2689 ) net changes in prices and production , transportation and administrative costs related to future production ( 1342 ) 6648 771 . ( in millions )                                                                                           | 2006             | 2005             | 2004            
sales and transfers of oil and gas produced net of production transportation and administrative costs     | $ -5312 ( 5312 ) | $ -3754 ( 3754 ) | $ -2689 ( 2689 )
net changes in prices and production transportation and administrative costs related to future production | -1342 ( 1342 )   | 6648             | 771             
extensions discoveries and improved recovery less related costs                                           | 1290             | 700              | 1349            
development costs incurred during the period                                                              | 1251             | 1030             | 609             
changes in estimated future development costs                                                             | -527 ( 527 )     | -552 ( 552 )     | -628 ( 628 )    
revisions of previous quantity estimates                                                                  | 1319             | 820              | 948             
net changes in purchases and sales of minerals in place                                                   | 30               | 4557             | 33              
accretion of discount                                                                                     | 1882             | 1124             | 757             
net change in income taxes                                                                                | -660 ( 660 )     | -6694 ( 6694 )   | -627 ( 627 )    
timing and other                                                                                          | -14 ( 14 )       | 307              | 97              
net change for the year                                                                                   | -2083 ( 2083 )   | 4186             | 620             
beginning of year                                                                                         | 10601            | 6415             | 5795            
end of year                                                                                               | $ 8518           | $ 10601          | $ 6415          
net change for the year from discontinued operations                                                      | $ -216 ( 216 )   | $ 162            | $ -152 ( 152 )   .
Question: what was the cash flow balance at the end of 2006?
Steps: Ask for number 8518
Answer: 8518.0
Question: what was the balance at the start of the year?
Steps: Ask for number 10601
Answer: 10601.0
Question: what is the ratio of the balance at the end of the year to the start?
Steps: divide(8518, 10601)
Answer: 0.80351
Question: what was the cash flow balance at the end of 2006?

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 ) 2006 2005 2004 sales and transfers of oil and gas produced , net of production , transportation and administrative costs $ ( 5312 ) $ ( 3754 ) $ ( 2689 ) net changes in prices and production , transportation and administrative costs related to future production ( 1342 ) 6648 771 . ( in millions )                                                                                           | 2006             | 2005             | 2004            
sales and transfers of oil and gas produced net of production transportation and administrative costs     | $ -5312 ( 5312 ) | $ -3754 ( 3754 ) | $ -2689 ( 2689 )
net changes in prices and production transportation and administrative costs related to future production | -1342 ( 1342 )   | 6648             | 771             
extensions discoveries and improved recovery less related costs                                           | 1290             | 700              | 1349            
development costs incurred during the period                                                              | 1251             | 1030             | 609             
changes in estimated future development costs                                                             | -527 ( 527 )     | -552 ( 552 )     | -628 ( 628 )    
revisions of previous quantity estimates                                                                  | 1319             | 820              | 948             
net changes in purchases and sales of minerals in place                                                   | 30               | 4557             | 33              
accretion of discount                                                                                     | 1882             | 1124             | 757             
net change in income taxes                                                                                | -660 ( 660 )     | -6694 ( 6694 )   | -627 ( 627 )    
timing and other                                                                                          | -14 ( 14 )       | 307              | 97              
net change for the year                                                                                   | -2083 ( 2083 )   | 4186             | 620             
beginning of year                                                                                         | 10601            | 6415             | 5795            
end of year                                                                                               | $ 8518           | $ 10601          | $ 6415          
net change for the year from discontinued operations                                                      | $ -216 ( 216 )   | $ 162            | $ -152 ( 152 )   .
Question: what was the cash flow balance at the end of 2006?
Steps: Ask for number 8518
Answer: 8518.0
Question: what was the balance at the start of the year?
Steps: Ask for number 10601
Answer: 10601.0
Question: what is the ratio of the balance at the end of the year to the start?
Steps: divide(8518, 10601)
Answer: 0.80351
Question: what was the cash flow balance at the end of 2006?
