Percent change in price index for petroleum imports, July 1999-July 2000 Percent Change Jul-99 13.5 Aug-99 11.7 Sep-99 8.3 Oct-99 1.7 Nov-99 4.1 Dec-99 6.3 Jan-00 3.5 Feb-00 14.9 Mar-00 -0.8 Apr-00 -11.3 May-00 4.3 Jun-00 10.0 Jul-00 -2.4