year corn soybeans
1957 48.3 23.2
1958 52.8 24.2
1959 53.1 23.5
1960 54.7 23.5
1961 62.4 25.1
1962 64.7 24.2
1963 67.9 24.4
1964 62.9 22.8
1965 74.1 24.5
1966 73.1 25.4
1967 80.1 24.5
1968 79.5 26.7
1969 85.9 27.4
1970 72.4 26.7
1971 88.1 27.5
1972 97.0 27.8
1973 91.3 27.8
1974 71.9 23.7
1975 86.4 28.9
1976 88.0 26.1
1977 90.8 30.6
1978 101.0 29.4
1979 109.5 32.1
1980 91.0 26.5
1981 108.9 30.1
1982 113.2 31.5
1983 81.1 26.2
1984 106.7 28.1
1985 118.0 34.1
1986 119.4 33.3
1987 119.8 33.9
1988 84.6 27.0
1989 116.3 32.3
1990 118.5 34.1
1991 108.6 34.2
1992 131.5 37.6
1993 100.7 32.6
1994 138.6 41.4
1995 113.5 35.3
1996 127.1 37.6
1997 126.7 38.9
1998 134.4 38.9
1999 133.8 36.6
2000 136.9 38.1