3-month percent changes in Employment Cost Index, benefits costs for State and local government, seasonally adjusted, Dec. 1998-Sept. 2000 3-month Percent change Dec. 1998 0.6 Mar. 1999 0.5 June 1999 0.6 Sep. 1999 0.4 Dec. 1999 1.2 Mar. 2000 1.0 June 2000 0.5 Sep. 2000 0.1