Percent change in import price indexes, all imports and petroleum imports, Dec. 1998.-Nov. 1999 All Petroleum imports imports Dec -1.0 -13.3 Jan 0.4 4.2 Feb -0.1 -0.5 Mar 0.2 13.9 Apr 1.1 20.3 May 0.7 7.3 Jun -0.1 0.4 Jul 1.0 13.5 Aug 1.1 11.7 Sep 1.1 9.8 Oct 0.5 3.5 Nov 0.5 1.9