Over-the-month percent change in import price indexes, petroleum imports, December 1999- December 2000 (not seasonally adjusted) Percent change Dec-99 6.3 Jan-00 3.5 Feb-00 14.9 Mar-00 -0.8 Apr-00 -11.3 May-00 4.5 Jun-00 10.6 Jul-00 -1.4 Aug-00 0.9 Sep-00 10.4 Oct-00 -2.9 Nov-00 1.6 Dec-00 -9.3