| Year | Rate | Year | Rate | Year | Rate | Year | Rate |
|---|
| | | | | |
| 1910 | $2.22 | 1938 | $2.77 | 1966 | $4.99 |
1994 | $7.064 (Res.) / $8.704 (Com.) |
| 1911 | $2.22 | 1939 | $2.77 | 1967 | $5.11 | 1995 | $7.048 (Res.) / $8.688 (Com.) |
| 1912 | $2.22 | 1940 | $2.74 | 1968 | $5.32 | 1996 | $7.152 (Res.) / $8.792 (Com.) |
| 1913 | $2.22 | 1941 | $2.74 | 1969 | $5.47 |
1997 | $7.222 (Res.) / $8.862 (Com.) |
| 1914 | $2.35 | 1942 | $2.77 | 1970 | $5.52 |
1998 | $7.142 (Res.) / $8.782 (Com.) |
| 1915 | $2.35 | 1943 | $2.75 | 1971 | $5.62 |
1999 | $7.307 (Res.) / $8.947 (Com.) |
| 1916 | $2.35 | 1944 | $2.74 | 1972 | $5.615 |
2000 | $7.325 (Res.) / $8.965 (Com.) |
| 1917 | $2.35 | 1945 | $2.75 | 1973 | $5.62 |
2001 | $7.2694 (Res.) / 8.9094 (Com.) |
| 1918 | $2.35 | 1946 | $2.73 | 1974 | $5.63 |
| 1919 | $2.35 | 1947 | $2.74 | 1975 | $5.69 |
| 1920 | $2.35 | 1948 | $2.74 | 1976 | $6.48 |
| 1921 | $2.415 | 1949 | $2.72 | 1977 | $6.42 |
| 1922 | $2.50 | 1950 | $2.74 | 1978 | $6.43 |
| 1923 | $2.43 | 1951 | $2.85 | 1979 | $6.35 |
| 1924 | $2.47 | 1952 | $2.89 | 1980 | $6.25 |
| 1925 | $2.57 | 1953 | $3.07 | 1981 | $6.25 |
| 1926 | $2.58 | 1954 | $3.10 | 1982 | $6.25 |
| 1927 | $2.59 | 1955 | $3.09 | 1983 | $6.14 |
| 1928 | $2.62 | 1956 | $3.27 | 1984 | $6.45 |
| 1929 | $2.69 | 1957 | $3.36 | 1985 | $5.482 (Res.) / $7.125 (Com.) |
| 1930 | $2.71 | 1958 | $3.62 | 1986 | $6.112 (Res.) / $7.752 (Com.) |
| 1931 | $2.71 | 1959 | $3.61 | 1987 | $5.370 (Res.) / $7.010 (Com.) |
| 1932 | $2.74 | 1960 | $3.79 | 1988 | $6.131 (Res.) / $7.771 (Com.) |
| 1933 | $2.74 | 1961 | $3.82 | 1989 | $6.038 (Res.) / $7.678 (Com.) |
| 1934 | $2.74 | 1962 | $4.06 | 1990 | $6.028 (Res.) / $7.668 (Com.) |
| 1935 | $2.77 | 1963 | $4.43 | 1991 | $6.728 (Res.) / $7.918 (Com.) |
| 1936 | $2.77 | 1964 | $4.53 | 1992 | $6.744 (Res.) / $8.384 (Com.) |
| 1937 | $2.77 | 1965 | $4.85 | 1993 | $6.770 (Res.) / $8.410 (Com.) |