CROP PRODUCTION INDEX


ALL CROP PRODUCTION INDEX, 1967-97
Year Index 1/ Year Index 1/ Year Index 1/
1967 82 1977 100 1987 99
1968 74 1978 97 1988 66
1969 77 1979 114 1989 110
1970 64 1980 92 1990 109
1971 83 1981 113 1991 99
1972 84 1982 115 1992 128
1973 83 1983 66 1993 112
1974 68 1984 97 1994 136
1975 100 1985 120 1995 102
1976 95 1986 112 1996 118
        1997 121
1/ 1977=100

All Crop Production

Note: The All Crop Production Index is the result of multiplying the 1997 production of all grain, hay, fruit, and vegetable crops by the 1977 season average price, then dividing that figure by the 1977 production of those same crops multiplied by the 1977 season average price. By keeping the price constant, production becomes the only variable and this eliminates price fluctuations. The purpose of this index is to equate production from year to year by making the units produced (i.e. bushels, tons, etc.) a neutral factor. The year 1977 is used as the base simply because it is the year that this index was developed.



Illinois Agricultural Statistics Service
Annual Summary - 1998		 Page 20


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