note 10 . commitments and contingencies credit-related commitments and contingencies : credit-related financial instruments , which are off-balance sheet , include indemnified securities financing , unfunded commitments to extend credit or purchase assets , and standby letters of credit . the potential loss associated with indemnified securities financing , unfunded commitments and standby letters of credit is equal to the total gross contractual amount , which does not consider the value of any collateral . the following table summarizes the total gross contractual amounts of credit-related off-balance sheet financial instruments at december 31 . amounts reported do not reflect participations to independent third parties. .

2009: indemnified securities financing: 365251
asset purchase agreements ( 1 ): 8211
unfunded commitments to extend credit: 18078
standby letters of credit: 4784
2008: indemnified securities financing: 324590
asset purchase agreements ( 1 ): 31780
unfunded commitments to extend credit: 20981
standby letters of credit: 6061

( 1 ) amount for 2009 excludes agreements related to the commercial paper conduits , which were consolidated in may 2009 ; see note 11 . approximately 81% ( 81 % ) of the unfunded commitments to extend credit expire within one year from the date of issue . since many of these commitments are expected to expire or renew without being drawn upon , the total commitment amount does not necessarily represent future cash requirements . securities finance : on behalf of our customers , we lend their securities to creditworthy brokers and other institutions . we generally indemnify our customers for the fair market value of those securities against a failure of the borrower to return such securities . collateral funds received in connection with our securities finance services are held by us as agent and are not recorded in our consolidated statement of condition . we require the borrowers to provide collateral in an amount equal to or in excess of 100% ( 100 % ) of the fair market value of the securities borrowed . the borrowed securities are revalued daily to determine if additional collateral is necessary . in this regard , we held , as agent , cash and u.s . government securities with an aggregate fair value of $ 375.92 billion and $ 333.07 billion as collateral for indemnified securities on loan at december 31 , 2009 and 2008 , respectively , presented in the table above . the collateral held by us is invested on behalf of our customers in accordance with their guidelines . in certain cases , the collateral is invested in third-party repurchase agreements , for which we indemnify the customer against loss of the principal invested . we require the repurchase agreement counterparty to provide collateral in an amount equal to or in excess of 100% ( 100 % ) of the amount of the repurchase agreement . the indemnified repurchase agreements and the related collateral are not recorded in our consolidated statement of condition . of the collateral of $ 375.92 billion at december 31 , 2009 and $ 333.07 billion at december 31 , 2008 referenced above , $ 77.73 billion at december 31 , 2009 and $ 68.37 billion at december 31 , 2008 was invested in indemnified repurchase agreements . we held , as agent , cash and securities with an aggregate fair value of $ 82.62 billion and $ 71.87 billion as collateral for indemnified investments in repurchase agreements at december 31 , 2009 and december 31 , 2008 , respectively . legal proceedings : in the ordinary course of business , we and our subsidiaries are involved in disputes , litigation and regulatory inquiries and investigations , both pending and threatened . these matters , if resolved adversely against us , may result in monetary damages , fines and penalties or require changes in our business practices . the resolution of these proceedings is inherently difficult to predict . however , we do not believe that the amount of any judgment , settlement or other action arising from any pending proceeding will have a material adverse effect on our consolidated financial condition , although the outcome of certain of the matters described below may have a material adverse effect on our consolidated results of operations for the period in which such matter is resolved .

Questions:
how much was kept as collateral in 2009?
how much was kept as collateral in 2008?
what is the difference in value between 2008 and 2009?
how much was kept as collateral in 2008?
what is the difference divided by the collateral kept in 2008?

Answers:
375.92
333.07
42.85
333.07
12.9%