Start Date | End Date | Rate |
---|---|---|
September 1, 1961 | October 1, 1968 | 2.0 percent |
October 2, 1968 | September 30, 1969 | 3.0 percent |
October 1, 1969 | June 30, 1971 | 3.25 percent |
July 1, 1971 | October 1, 1984 | 4.0 percent |
October 2, 1984 | December 31, 1986 | 4.125 percent |
January 1, 1987 | September 30, 1987 | 5.25 percent |
October 1, 1987 | June 30, 1990 | 6.0 percent |
July 1, 1990 | Present | 6.25 percent |