Percent change in price index for petroleum imports, August 1999-August 2000 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 4.5 Jun-00 10.6 Jul-00 -1.6 Aug-00 0.6