Over-the-month percent change in price index for petroleum imports, March 2000-March 2001 (not seasonally adjusted) Percent change 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 -2.8 Nov-00 0.9 Dec-00 -9.8 Jan-01 -6.2 Feb-01 1.1 Mar-01 -5.9