pre_text: 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 ) 2004 2003 2002 sales and transfers of oil and gas produced , net of production , transportation , and administrative costs $ ( 2715 ) $ ( 2487 ) $ ( 1983 ) net changes in prices and production , transportation and administrative costs related to future production 950 1178 2795 .
post_text: .
table: <i>(In millions)</i> 2004 2003 2002
table: Sales and transfers of oil and gas produced, net of production, transportation, and administrative costs $(2,715) $(2,487) $(1,983)
table: Net changes in prices and production, transportation and administrative costs related to future production 950 1,178 2,795
table: Extensions, discoveries and improved recovery, less related costs 1,352 618 1,032
table: Development costs incurred during the period 711 802 499
table: Changes in estimated future development costs (556) (478) (297)
table: Revisions of previous quantity estimates 494 348 311
table: Net changes in purchases and sales of minerals in place 33 (531) 737
table: Net change in exchanges of minerals in place – 403 –
table: Accretion of discount 790 807 417
table: Net change in income taxes (529) 65 (1,288)
table: Timing and other (62) (165) 2
table: Net change for the year 468 560 2,225
table: Beginning of year 6,001 5,441 3,216
table: End of year $6,469 $6,001 $5,441
table: Net change for the year from discontinued operations $– $(384) $212
question: Analyse this data from a financial earnings document. what was the 2004 rate of decrease in development costs?