| Year | June | July | |||
| 10 | 20 | 30 | 10 | 20 | |
| 1987 | 5 | 32 | 76 | 100 | |
| 1988 | 4 | 19 | 62 | 90 | 100 |
| 1989 | 1 | 4 | 22 | 78 | 97 |
| 1990 | 0 | 3 | 11 | 48 | 85 |
| 1991 | 13 | 36 | 62 | 91 | 100 |
| 1992 | 1 | 3 | 24 | 67 | 93 |
| 1993 | 2 | 4 | 7 | 31 | 64 |
| 1994 | 1 | 7 | 38 | 91 | 98 |
| 1995 | 0 | 2 | 6 | 30 | 78 |
| 1996 | 0 | 1 | 5 | 27 | 63 |
| Year | June | July | August | ||
| 30 | 10 | 20 | 30 | 10 | |
| 1987 | 10 | 31 | 74 | 96 | 100 |
| 1988 | 1 | 27 | 59 | 89 | 100 |
| 1989 | 1 | 8 | 43 | 85 | 99 |
| 1990 | 0 | 5 | 16 | 54 | 93 |
| 1991 | 10 | 56 | 92 | 100 | |
| 1992 | 1 | 3 | 8 | 33 | 80 |
| 1993 | 0 | 1 | 4 | 23 | 76 |
| 1994 | 0 | 9 | 40 | 84 | 98 |
| 1995 | 0 | 1 | 15 | 43 | 83 |
| 1996 | 0 | 3 | 34 | 72 | |
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| Illinois Agricultural Statistics Service Annual Summary - 1997 |
Page 67 |
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