| Year | Total | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
| 1991 | 1 | 1 | |||||||||||
| 1990 | - | ||||||||||||
| 1989 | 22 | 4 | 3 | 1 | 4 | 2 | 2 | 3 | 1 | 2 | |||
| 1988 | 30 | 3 | 9 | 2 | 1 | 2 | 3 | 1 | 4 | 1 | 1 | 3 | |
| 1987 | 49 | 3 | 3 | 2 | 9 | 4 | 3 | 5 | 4 | 2 | 8 | 6 | |
| 1986 | 30 | 3 | 2 | 4 | 2 | 9 | 3 | 3 | 4 | ||||
| 1985 | 104 | 4 | 10 | 15 | 9 | 9 | 9 | 10 | 13 | 11 | 6 | 7 | 1 |
| 1984 | 51 | 10 | 2 | 14 | 16 | 5 | 1 | 3 | |||||
| 1983 | 102 | 7 | 10 | 9 | 9 | 4 | 9 | 8 | 7 | 10 | 8 | 11 | 10 |
| 1982 | 120 | 8 | 13 | 12 | 12 | 13 | 16 | 8 | 11 | 10 | 6 | 9 | 2 |
| 1981 | 112 | 3 | 10 | 11 | 13 | 9 | 4 | 9 | 14 | 7 | 13 | 9 | 10 |
| 1980 | 124 | 10 | 13 | 14 | 15 | 9 | 10 | 7 | 9 | 11 | 10 | 10 | 6 |
| 1979 | 125 | 7 | 13 | 13 | 3 | 8 | 15 | 9 | 14 | 12 | 8 | 13 | 10 |
| 1978 | 142 | 11 | 13 | 15 | 11 | 14 | 4 | 13 | 10 | 11 | 12 | 15 | 13 |
| 1977 | 141 | 8 | 16 | 16 | 18 | 11 | 10 | 9 | 11 | 4 | 12 | 11 | 15 |
| 1976 | 131 | 6 | 4 | 9 | 13 | 13 | 13 | 12 | 12 | 8 | 14 | 11 | 16 |
| 1975 | 155 | 8 | 15 | 14 | 15 | 14 | 9 | 9 | 15 | 10 | 17 | 16 | 13 |
| 1974 | 122 | 9 | 10 | 8 | 11 | 11 | 11 | 8 | 3 | 11 | 13 | 14 | 13 |
| 1973 | 86 | 3 | 6 | 7 | 11 | 7 | 15 | 10 | 14 | 13 | |||
| 1647 |