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| May 31, 1981 or prior | $7.40 |
| June 1, 1981 and May 31, 1982 | $8.60 |
| June 1, 1982 and May 31, 1985 | $10.00 |
| June 1, 1985 and May 31, 1986 | $10.50 |
| June 1, 1986 and May 31, 1987 | $11.00 |
| June 1, 1987 and May 31, 1988 | $11.50 |
| June 1, 1988 and July 31, 1990 | $12.00 |
| August 1, 1990 and July 31, 1991 | $14.00 |
| August 1, 1991 and July 31, 1992 | $16.00 |
| August 1, 1992 and July 31, 1993 | $18.00 |
| August 1, 1993 and July 31, 1994 | $20.00 |
| August 1, 1994 and January 31, 1995 | $22.00 |
| February 1, 1995 and June 30, 1995 | $24.00 |
| July 1, 1995 and June 30, 2003 | $30.00 |
| July 1, 2003 and June 30, 2004 | $34.00 |
| July 1, 2004 and June 30, 2005 | $38.00 |
| July 1, 2005 and the present | $40.00 |
