marathon oil corporation notes to consolidated financial statements the changes in the carrying amount of goodwill for the years ended december 31 , 2007 , and 2008 , were as follows : ( in millions ) e&p osm rm&t total .
[['( in millions )', 'e&p', 'osm', 'rm&t', 'total'], ['balance as of december 31 2006', '$ 519', '$ 2013', '$ 879', '$ 1398'], ['acquired', '71', '1437', '2013', '1508'], ['adjusted ( a )', '2013', '2013', '-7 ( 7 )', '-7 ( 7 )'], ['balance as of december 31 2007', '590', '1437', '872', '2899'], ['adjusted ( a )', '-17 ( 17 )', '-25 ( 25 )', '7', '-35 ( 35 )'], ['impaired', '2013', '-1412 ( 1412 )', '2013', '-1412 ( 1412 )'], ['disposed ( b )', '-5 ( 5 )', '', '2013', '-5 ( 5 )'], ['balance as of december 31 2008', '$ 568', '$ 2013', '$ 879', '$ 1447']]
( a ) adjustments related to prior period income tax and royalty adjustments .( b ) goodwill was allocated to the norwegian outside-operated properties sold in 2008 .17 .fair value measurements as defined in sfas no .157 , fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date .sfas no .157 describes three approaches to measuring the fair value of assets and liabilities : the market approach , the income approach and the cost approach , each of which includes multiple valuation techniques .the market approach uses prices and other relevant information generated by market transactions involving identical or comparable assets or liabilities .the income approach uses valuation techniques to measure fair value by converting future amounts , such as cash flows or earnings , into a single present value amount using current market expectations about those future amounts .the cost approach is based on the amount that would currently be required to replace the service capacity of an asset .this is often referred to as current replacement cost .the cost approach assumes that the fair value would not exceed what it would cost a market participant to acquire or construct a substitute asset of comparable utility , adjusted for obsolescence .sfas no .157 does not prescribe which valuation technique should be used when measuring fair value and does not prioritize among the techniques .sfas no .157 establishes a fair value hierarchy that prioritizes the inputs used in applying the various valuation techniques .inputs broadly refer to the assumptions that market participants use to make pricing decisions , including assumptions about risk .level 1 inputs are given the highest priority in the fair value hierarchy while level 3 inputs are given the lowest priority .the three levels of the fair value hierarchy are as follows .2022 level 1 2013 observable inputs that reflect unadjusted quoted prices for identical assets or liabilities in active markets as of the reporting date .active markets are those in which transactions for the asset or liability occur in sufficient frequency and volume to provide pricing information on an ongoing basis .2022 level 2 2013 observable market-based inputs or unobservable inputs that are corroborated by market data .these are inputs other than quoted prices in active markets included in level 1 , which are either directly or indirectly observable as of the reporting date .2022 level 3 2013 unobservable inputs that are not corroborated by market data and may be used with internally developed methodologies that result in management 2019s best estimate of fair value .we use a market or income approach for recurring fair value measurements and endeavor to use the best information available .accordingly , valuation techniques that maximize the use of observable inputs are favored .financial assets and liabilities are classified in their entirety based on the lowest priority level of input that is significant to the fair value measurement .the assessment of the significance of a particular input to the fair value measurement requires judgment and may affect the placement of assets and liabilities within the levels of the fair value hierarchy. .

Question: by what percentage did total goodwill decline from 2007 to 2008 year end?
Answer: -50.1%