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%
|
Illinois:
1996 49.19%
1994 35.66%
1992 58.94%
1990 38.35%
1988 52.79%
1986 37.68%
1984 57.04%
1982 43.98%
1980 57.68%
1978 39.16%
1976 59.44%
1974 37.72%
1972 62.34%
1970 52.97%
1968 69.29%
1966 58.43%
1964 73.23%
1962 57.69%
1960 75.54%
|
