impairment the following table presents net unrealized losses on securities available for sale as of december 31: .
what was the percentage change in the fair value from 2010 to 2011
the net unrealized amounts presented above excluded the remaining net unrealized losses related to reclassifications of securities available for sale to securities held to maturity . these unrealized losses related to reclassifications totaled $ 303 million , or $ 189 million after-tax , and $ 523 million , or $ 317 million after-tax , as of december 31 , 2011 and 2010 , respectively , and were recorded in accumulated other comprehensive income , or oci . refer to note 12 to the consolidated financial statements included under item 8 . the decline in these remaining after-tax unrealized losses related to reclassifications from december 31 , 2010 to december 31 , 2011 resulted primarily from amortization . we conduct periodic reviews of individual securities to assess whether other-than-temporary impairment exists . to the extent that other-than-temporary impairment is identified , the impairment is broken into a credit component and a non-credit component . the credit component is recorded in our consolidated statement of income , and the non-credit component is recorded in oci to the extent that we do not intend to sell the security . our assessment of other-than-temporary impairment involves an evaluation , more fully described in note 3 , of economic and security-specific factors . such factors are based on estimates , derived by management , which contemplate current market conditions and security-specific performance . to the extent that market conditions are worse than management 2019s expectations , other-than-temporary impairment could increase , in particular , the credit component that would be recorded in our consolidated statement of income . given the exposure of our investment securities portfolio , particularly mortgage- and asset-backed securities , to residential mortgage and other consumer credit risks , the performance of the u.s . housing market is a significant driver of the portfolio 2019s credit performance . as such , our assessment of other-than-temporary impairment relies to a significant extent on our estimates of trends in national housing prices . generally , indices that measure trends in national housing prices are published in arrears . as of september 30 , 2011 , national housing prices , according to the case-shiller national home price index , had declined by approximately 31.3% ( 31.3 % ) peak-to-current . overall , management 2019s expectation , for purposes of its evaluation of other-than-temporary impairment as of december 31 , 2011 , was that housing prices would decline by approximately 35% ( 35 % ) peak-to-trough . the performance of certain mortgage products and vintages of securities continues to deteriorate . in addition , management continues to believe that housing prices will decline further as indicated above . the combination of these factors has led to an increase in management 2019s overall loss expectations . our investment portfolio continues to be sensitive to management 2019s estimates of future cumulative losses . ultimately , other-than- temporary impairment is based on specific cusip-level detailed analysis of the unique characteristics of each security . in addition , we perform sensitivity analysis across each significant product type within the non-agency u.s . residential mortgage-backed portfolio . we estimate , for example , that other-than-temporary impairment of the investment portfolio could increase by approximately $ 10 million to $ 50 million , if national housing prices were to decline by 37% ( 37 % ) to 39% ( 39 % ) peak-to-trough , compared to management 2019s expectation of 35% ( 35 % ) described above . this sensitivity estimate is based on a number of factors , including , but not limited to , the level of housing prices and the timing of defaults . to the extent that such factors differ substantially from management 2019s current expectations , resulting loss estimates may differ materially from those stated . excluding the securities for which other-than-temporary impairment was recorded in 2011 , management considers the aggregate decline in fair value of the remaining .