. as of may 31 , 2009 , we had no amounts outstanding under our multi-year , $ 1 billion revolving credit facility in place with a group of banks . the facility matures in december 2012 . based on our current long-term senior unsecured debt ratings of a+ and a1 from standard and poor 2019s corporation and moody 2019s investor services , respectively , the interest rate charged on any outstanding borrowings would be the prevailing london interbank offer rate ( 201clibor 201d ) plus 0.15% ( 0.15 % )