state street corporation notes to consolidated financial statements ( continued ) with respect to the 5.25% ( 5.25 % ) subordinated bank notes due 2018 , state street bank is required to make semi- annual interest payments on the outstanding principal balance of the notes on april 15 and october 15 of each year , and the notes qualify for inclusion in tier 2 regulatory capital under current federal regulatory capital guidelines . with respect to the 5.30% ( 5.30 % ) subordinated notes due 2016 and the floating-rate subordinated notes due 2015 , state street bank is required to make semi-annual interest payments on the outstanding principal balance of the 5.30% ( 5.30 % ) subordinated notes on january 15 and july 15 of each year , and quarterly interest payments on the outstanding principal balance of the floating-rate notes on march 8 , june 8 , september 8 and december 8 of each year . each of the subordinated notes qualifies for inclusion in tier 2 regulatory capital under current federal regulatory capital guidelines . note 11 . commitments , guarantees and contingencies commitments : we had unfunded off-balance sheet commitments to extend credit totaling $ 21.30 billion and $ 17.86 billion as of december 31 , 2013 and 2012 , respectively . the potential losses associated with these commitments equal the gross contractual amounts , and do not consider the value of any collateral . approximately 75% ( 75 % ) of our 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 gross contractual amounts do not necessarily represent our future cash requirements . guarantees : off-balance sheet guarantees are composed of indemnified securities financing , stable value protection , unfunded commitments to purchase assets , and standby letters of credit . the potential losses associated with these guarantees equal the gross contractual amounts , and do not consider the value of any collateral . the following table presents the aggregate gross contractual amounts of our off-balance sheet guarantees as of december 31 , 2013 and 2012 . amounts presented do not reflect participations to independent third parties. .

2013: indemnified securities financing: 320078
stable value protection: 24906
asset purchase agreements: 4685
standby letters of credit: 4612
2012: indemnified securities financing: 302341
stable value protection: 33512
asset purchase agreements: 5063
standby letters of credit: 4552

indemnified securities financing on behalf of our clients , we lend their securities , as agent , to brokers and other institutions . in most circumstances , we indemnify our clients for the fair market value of those securities against a failure of the borrower to return such securities . we require the borrowers to maintain collateral in an amount equal to or in excess of 100% ( 100 % ) of the fair market value of the securities borrowed . securities on loan and the collateral are revalued daily to determine if additional collateral is necessary or if excess collateral is required to be returned to the borrower . collateral received in connection with our securities lending services is held by us as agent and is not recorded in our consolidated statement of condition . the cash collateral held by us as agent is invested on behalf of our clients . in certain cases , the cash collateral is invested in third-party repurchase agreements , for which we indemnify the client against loss of the principal invested . we require the counterparty to the indemnified repurchase agreement to provide collateral in an amount equal to or in excess of 100% ( 100 % ) of the amount of the repurchase agreement . in our role as agent , the indemnified repurchase agreements and the related collateral held by us are not recorded in our consolidated statement of condition. .

Questions:
what was the total in asset purchase agreements in 2013?
and what was it in 2012?
what was, then, the change over the year?
and how much does this change represent in relation to that total in 2012, in percentage?

Answers:
4685
5063
-378
-7.5%