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 .

Table:
( 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%
Calculation: subtract(2899, 1447), divide(#0, 2899)