the aes corporation notes to consolidated financial statements 2014 ( continued ) december 31 , 2011 , 2010 , and 2009 ( 1 ) weighted average interest rate at december 31 , 2011 . ( 2 ) the company has interest rate swaps and interest rate option agreements in an aggregate notional principal amount of approximately $ 3.6 billion on non-recourse debt outstanding at december 31 , 2011 . the swap agreements economically change the variable interest rates on the portion of the debt covered by the notional amounts to fixed rates ranging from approximately 1.44% ( 1.44 % ) to 6.98% ( 6.98 % ) . the option agreements fix interest rates within a range from 1.00% ( 1.00 % ) to 7.00% ( 7.00 % ) . the agreements expire at various dates from 2016 through 2028 . ( 3 ) multilateral loans include loans funded and guaranteed by bilaterals , multilaterals , development banks and other similar institutions . ( 4 ) non-recourse debt of $ 704 million and $ 945 million as of december 31 , 2011 and 2010 , respectively , was excluded from non-recourse debt and included in current and long-term liabilities of held for sale and discontinued businesses in the accompanying consolidated balance sheets . non-recourse debt as of december 31 , 2011 is scheduled to reach maturity as set forth in the table below : december 31 , annual maturities ( in millions ) .
what percentage of total non-recourse debt as of december 31 , 2011 is due in 2015?
as of december 31 , 2011 , aes subsidiaries with facilities under construction had a total of approximately $ 1.4 billion of committed but unused credit facilities available to fund construction and other related costs . excluding these facilities under construction , aes subsidiaries had approximately $ 1.2 billion in a number of available but unused committed revolving credit lines to support their working capital , debt service reserves and other business needs . these credit lines can be used in one or more of the following ways : solely for borrowings ; solely for letters of credit ; or a combination of these uses . the weighted average interest rate on borrowings from these facilities was 14.75% ( 14.75 % ) at december 31 , 2011 . on october 3 , 2011 , dolphin subsidiary ii , inc . ( 201cdolphin ii 201d ) , a newly formed , wholly-owned special purpose indirect subsidiary of aes , entered into an indenture ( the 201cindenture 201d ) with wells fargo bank , n.a . ( the 201ctrustee 201d ) as part of its issuance of $ 450 million aggregate principal amount of 6.50% ( 6.50 % ) senior notes due 2016 ( the 201c2016 notes 201d ) and $ 800 million aggregate principal amount of 7.25% ( 7.25 % ) senior notes due 2021 ( the 201c7.25% ( 201c7.25 % ) 2021 notes 201d , together with the 2016 notes , the 201cnotes 201d ) to finance the acquisition ( the 201cacquisition 201d ) of dpl . upon closing of the acquisition on november 28 , 2011 , dolphin ii was merged into dpl with dpl being the surviving entity and obligor . the 2016 notes and the 7.25% ( 7.25 % ) 2021 notes are included under 201cnotes and bonds 201d in the non-recourse detail table above . see note 23 2014acquisitions and dispositions for further information . interest on the 2016 notes and the 7.25% ( 7.25 % ) 2021 notes accrues at a rate of 6.50% ( 6.50 % ) and 7.25% ( 7.25 % ) per year , respectively , and is payable on april 15 and october 15 of each year , beginning april 15 , 2012 . prior to september 15 , 2016 with respect to the 2016 notes and july 15 , 2021 with respect to the 7.25% ( 7.25 % ) 2021 notes , dpl may redeem some or all of the 2016 notes or 7.25% ( 7.25 % ) 2021 notes at par , plus a 201cmake-whole 201d amount set forth in .