| Year | March | April | May | |||
| 20 | 30 | 10 | 20 | 30 | 10 | |
| 1987 | 23 | 33 | 64 | 82 | 100 | |
| 1988 | 1 | 12 | 35 | 79 | 94 | 100 |
| 1989 | 1 | 10 | 32 | 71 | 94 | 99 |
| 1990 | 1 | 11 | 36 | 66 | 91 | 97 |
| 1991 | 19 | 25 | 43 | 73 | 91 | 97 |
| 1992 | 20 | 30 | 60 | 81 | 89 | 96 |
| 1993 | 0 | 2 | 4 | 8 | 24 | 49 |
| 1994 | 2 | 31 | 67 | 79 | 97 | 98 |
| 1995 | 6 | 11 | 30 | 52 | 65 | 86 |
| 1996 | 3 | 10 | 40 | 83 | 95 | 97 |
| Year | May | June | |||
| 20 | 30 | 10 | 20 | 30 | |
| 1987 | 5 | 41 | 83 | 96 | 100 |
| 1988 | 5 | 22 | 63 | 93 | 100 |
| 1989 | 2 | 9 | 38 | 83 | 98 |
| 1990 | 0 | 7 | 19 | 59 | 91 |
| 1991 | 12 | 35 | 77 | 93 | 100 |
| 1992 | 4 | 11 | 45 | 84 | 98 |
| 1993 | 0 | 3 | 23 | 42 | 70 |
| 1994 | 5 | 20 | 58 | 89 | 97 |
| 1995 | 13 | 18 | 22 | 56 | 90 |
| 1996 | 10 | 14 | 16 | 30 | 69 |
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| Illinois Agricultural Statistics Service Annual Summary - 1997 |
Page 66 |
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