National:
1996 48.99%
1994 38.79%
1992 55.24%
1990 36.53%
1988 50.11%
1986 36.42%
1984 53.11%
1982 40.09%
1980 52.56%
1978 37.77%
1976 53.55%
1974 38.31%
1972 55.21%
1970 46.78%
1968 60.84%
1966 48.40%
1964 61.92%
1962 47.36%
1960 63.06%
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Mississippi:
1996 45.58%
1994 32.56%
1992 52.76%
1990 20.11%
1988 50.49%
1986 29.01%
1984 52.20%
1982 36.42%
1980 51.81%
1978 34.92%
1976 48.00%
1974 19.90%
1972 44.18%
1970 25.88%
1968 53.26%
1966 32.47%
1964 33.90%
1962 13.41%
1960 25.33%
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