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

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what was the net change in development costs from 2006 to 2007? 403.0

what were development costs in 2007?