Links to the rates effective the first pay period that began on or after the starting date shown below.
- Jan. 1, 2005
- Jan. 1, 2004
- Jan. 1, 2003
- April 24, 2000
- April 24, 1999
- Jan. 1, 1993
- Aug. 1, 1986
- Aug. 1, 1985
- May 1, 1984
- April 1, 1981
- Sep. 1, 1978
- Feb. 28, 1975
- July 1, 1973
- April 1, 1970
- Feb. 14, 1968
- Aug. 28, 1954