the impairment tests performed for intangible assets as of july 31 , 2013 , 2012 and 2011 indicated no impairment charges were required . estimated amortization expense for finite-lived intangible assets for each of the five succeeding years is as follows : ( in millions ) .
what is the percentage increase in the maximum aggregate amount that may be borrowed under the cp program from 2009 to 2011?
indefinite-lived acquired management contracts in july 2013 , in connection with the credit suisse etf transaction , the company acquired $ 231 million of indefinite-lived management contracts . in march 2012 , in connection with the claymore transaction , the company acquired $ 163 million of indefinite-lived etp management contracts . finite-lived acquired management contracts in october 2013 , in connection with the mgpa transaction , the company acquired $ 29 million of finite-lived management contracts with a weighted-average estimated useful life of approximately eight years . in september 2012 , in connection with the srpep transaction , the company acquired $ 40 million of finite- lived management contracts with a weighted-average estimated useful life of approximately 10 years . 11 . other assets at march 31 , 2013 , blackrock held an approximately one- third economic equity interest in private national mortgage acceptance company , llc ( 201cpnmac 201d ) , which is accounted for as an equity method investment and is included in other assets on the consolidated statements of financial condition . on may 8 , 2013 , pennymac became the sole managing member of pnmac in connection with an initial public offering of pennymac ( the 201cpennymac ipo 201d ) . as a result of the pennymac ipo , blackrock recorded a noncash , nonoperating pre-tax gain of $ 39 million related to the carrying value of its equity method investment . subsequent to the pennymac ipo , the company contributed 6.1 million units of its investment to a new donor advised fund ( the 201ccharitable contribution 201d ) . the fair value of the charitable contribution was $ 124 million and is included in general and administration expenses on the consolidated statements of income . in connection with the charitable contribution , the company also recorded a noncash , nonoperating pre-tax gain of $ 80 million related to the contributed investment and a tax benefit of approximately $ 48 million . the carrying value and fair value of the company 2019s remaining interest ( approximately 20% ( 20 % ) or 16 million shares and units ) was approximately $ 127 million and $ 273 million , respectively , at december 31 , 2013 . the fair value of the company 2019s interest reflected the pennymac stock price at december 31 , 2013 ( level 1 input ) . 12 . borrowings short-term borrowings the carrying value of short-term borrowings at december 31 , 2012 included $ 100 million under the 2012 revolving credit facility . 2013 revolving credit facility . in march 2011 , the company entered into a five-year $ 3.5 billion unsecured revolving credit facility ( the 201c2011 credit facility 201d ) . in march 2012 , the 2011 credit facility was amended to extend the maturity date by one year to march 2017 and in april 2012 the amount of the aggregate commitment was increased to $ 3.785 billion ( the 201c2012 credit facility 201d ) . in march 2013 , the company 2019s credit facility was amended to extend the maturity date by one year to march 2018 and the amount of the aggregate commitment was increased to $ 3.990 billion ( the 201c2013 credit facility 201d ) . the 2013 credit facility permits the company to request up to an additional $ 1.0 billion of borrowing capacity , subject to lender credit approval , increasing the overall size of the 2013 credit facility to an aggregate principal amount not to exceed $ 4.990 billion . interest on borrowings outstanding accrues at a rate based on the applicable london interbank offered rate plus a spread . the 2013 credit facility requires the company not to exceed a maximum leverage ratio ( ratio of net debt to earnings before interest , taxes , depreciation and amortization , where net debt equals total debt less unrestricted cash ) of 3 to 1 , which was satisfied with a ratio of less than 1 to 1 at december 31 , 2013 . the 2013 credit facility provides back- up liquidity , funds ongoing working capital for general corporate purposes and funds various investment opportunities . at december 31 , 2013 , the company had no amount outstanding under the 2013 credit facility . commercial paper program . on october 14 , 2009 , blackrock established a commercial paper program ( the 201ccp program 201d ) under which the company could issue unsecured commercial paper notes ( the 201ccp notes 201d ) on a private placement basis up to a maximum aggregate amount outstanding at any time of $ 3.0 billion . on may 13 , 2011 , blackrock increased the maximum aggregate amount that may be borrowed under the cp program to $ 3.5 billion . on may 17 , 2012 , blackrock increased the maximum aggregate amount to $ 3.785 billion . in april 2013 , blackrock increased the maximum aggregate amount for which the company could issue unsecured cp notes on a private-placement basis up to a maximum aggregate amount outstanding at any time of $ 3.990 billion . the commercial paper program is currently supported by the 2013 credit facility . at december 31 , 2013 and 2012 , blackrock had no cp notes outstanding. .