human
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:.
| 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% |
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.
Please compute the result.
what is the difference of credit outstanding and used at the end of 2007?
assistant
130.0
human
what is the percent of credit used?
assistant
0.86667