| Year | Total | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
| 1990 | 2 | 1 | 1 | ||||||||||
| 1989 | 20 | 9 | 6 | 3 | 1 | 1 | |||||||
| 1988 | 41 | 1 | 3 | 15 | 3 | 1 | 2 | 4 | 3 | 9 | |||
| 1987 | 52 | 9 | 12 | 6 | 22 | 1 | 1 | 1 | |||||
| 1986 | 93 | 3 | 3 | 3 | 2 | 1 | 8 | 13 | 12 | 12 | 15 | 10 | 11 |
| 1985 | 103 | 10 | 4 | 9 | 11 | 7 | 14 | 11 | 9 | 3 | 23 | 1 | 1 |
| 1984 | 126 | 6 | 10 | 12 | 17 | 4 | 2 | 1 | 6 | 18 | 18 | 13 | 19 |
| 1983 | 130 | 2 | 4 | 3 | 2 | 5 | 6 | 13 | 22 | 20 | 18 | 19 | 16 |
| 1982 | 37 | 5 | 3 | 11 | 1 | 1 | 2 | 9 | 3 | 2 | |||
| 1981 | 64 | 10 | 11 | 15 | 12 | 2 | 1 | 1 | 1 | 1 | 7 | 3 | |
| 1980 | 106 | 10 | 10 | 10 | 25 | 4 | 5 | 11 | 14 | 4 | 9 | 4 | |
| 1979 | 140 | 5 | 2 | 12 | 15 | 8 | 12 | 14 | 13 | 11 | 22 | 19 | 7 |
| 1978 | 44 | 5 | 1 | 3 | 6 | 4 | 9 | 3 | 4 | 1 | 4 | 4 | |
| 1977 | 36 | 1 | 2 | 2 | 4 | 2 | 1 | 6 | 3 | 6 | 5 | 4 | |
| 1976 | 119 | 13 | 10 | 8 | 9 | 8 | 8 | 12 | 11 | 10 | 14 | 11 | 5 |
| 1975 | 101 | 11 | 4 | 3 | 4 | 3 | 14 | 10 | 11 | 9 | 16 | 7 | 9 |
| 1974 | 29 | 1 | 1 | 3 | 5 | 1 | 1 | 4 | 1 | 2 | 3 | 7 | |
| 1973 | 25 | 2 | 1 | 5 | 5 | 2 | 4 | 2 | 1 | 1 | 2 | ||
| 1268 |
