impairment the following table presents net unrealized losses on securities available for sale as of december 31: .

(In millions)
2011
2010
Fair value
$99,832
$81,881
Amortized cost
100,013
82,329
Net unrealized loss, pre-tax
$(181)
$(448)
Net unrealized loss, after-tax
$(113)
$(270)

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 .

Question: Analyse this data from a financial earnings document. what was the percentage change in the fair value from 2010 to 2011
Choices:
0
4.56136
0.21923
17951
-113.21923
Correct choice index: 2