{"pre_text": ["notes to consolidated financial statements certain of aon 2019s european subsidiaries have a a650 million ( u.s .", "$ 942 million ) multi-currency revolving loan credit facility .", "this facility will mature in october 2010 , unless aon opts to extend the facility .", "commitment fees of 8.75 basis points are payable on the unused portion of the facility .", "at december 31 , 2007 , aon has borrowed a376 million and $ 250 million ( $ 795 million ) under this facility .", "at december 31 , 2006 , a307 million was borrowed .", "at december 31 , 2007 , $ 250 million of the euro facility is classified as short-term debt in the consolidated statements of financial position .", "aon has guaranteed the obligations of its subsidiaries with respect to this facility .", "aon maintains a $ 600 million , 5-year u.s .", "committed bank credit facility to support commercial paper and other short-term borrowings , which expires in february 2010 .", "this facility permits the issuance of up to $ 150 million in letters of credit .", "at december 31 , 2007 and 2006 , aon had $ 20 million in letters of credit outstanding .", "based on aon 2019s current credit ratings , commitment fees of 10 basis points are payable on the unused portion of the facility .", "for both the u.s .", "and euro facilities , aon is required to maintain consolidated net worth , as defined , of at least $ 2.5 billion , a ratio of consolidated ebitda ( earnings before interest , taxes , depreciation and amortization ) to consolidated interest expense of 4 to 1 and a ratio of consolidated debt to ebitda of not greater than 3 to 1 .", "aon also has other foreign facilities available , which include a a337.5 million ( $ 74 million ) facility , a a25 million ( $ 36 million ) facility , and a a20 million ( $ 29 million ) facility .", "outstanding debt securities , including aon capital a 2019s , are not redeemable by aon prior to maturity .", "there are no sinking fund provisions .", "interest is payable semi-annually on most debt securities .", "repayments of long-term debt are $ 548 million , $ 382 million and $ 225 million in 2010 , 2011 and 2012 , respectively .", "other information related to aon 2019s debt is as follows: ."], "post_text": ["lease commitments aon has noncancelable operating leases for certain office space , equipment and automobiles .", "these leases expire at various dates and may contain renewal and expansion options .", "in addition to base rental costs , occupancy lease agreements generally provide for rent escalations resulting from increased assessments for real estate taxes and other charges .", "approximately 81% ( 81 % ) of aon 2019s lease obligations are for the use of office space .", "rental expense for operating leases amounted to $ 368 million , $ 350 million and $ 337 million for 2007 , 2006 and 2005 , respectively , after deducting rentals from subleases ( $ 40 million , $ 33 million and $ 29 million for 2007 , 2006 and 2005 , respectively ) .", "aon corporation ."], "table": [["years ended december 31", "2007", "2006", "2005"], ["interest paid ( millions )", "$ 147", "$ 130", "$ 130"], ["weighted-average interest rates 2014 short-term borrowings", "5.1% ( 5.1 % )", "4.4% ( 4.4 % )", "3.5% ( 3.5 % )"]], "table_ori": [["Years ended December 31", "2007", "2006", "2005"], ["Interest paid (millions)", "$147", "$130", "$130"], ["Weighted-average interest rates — short-term borrowings", "5.1%", "4.4%", "3.5%"]]}

Question: what percentage of the letter of credit remains available as of december 31 , 2007?
Evidence:
text_1: $ 942 million ) multi-currency revolving loan credit facility .
text_2: this facility will mature in october 2010 , unless aon opts to extend the facility .
text_10: this facility permits the issuance of up to $ 150 million in letters of credit .
text_11: at december 31 , 2007 and 2006 , aon had $ 20 million in letters of credit outstanding .
Program: subtract(150, 20), divide(#0, 150)
Answer:
str_answer: 86.7%
exe_answer: 0.86667