| Year | Total | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
| 1989 | 13 | 2 | 4 | 4 | 1 | 1 | 1 | ||||||
| 1988 | 8 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | ||||
| 1987 | 89 | 7 | 9 | 15 | 7 | 5 | 7 | 8 | 2 | 4 | 8 | 13 | 4 |
| 1986 | 160 | 19 | 17 | 17 | 10 | 18 | 10 | 7 | 15 | 18 | 7 | 13 | 9 |
| 1985 | 185 | 17 | 16 | 17 | 18 | 23 | 16 | 15 | 12 | 14 | 14 | 13 | 10 |
| 1984 | 78 | 1 | 2 | 3 | 4 | 4 | 1 | 3 | 5 | 19 | 19 | 17 | |
| 1983 | 37 | 5 | 4 | 4 | 2 | 7 | 4 | 9 | 1 | 1 | |||
| 1982 | 15 | 2 | 1 | 1 | 3 | 1 | 2 | 3 | 2 | ||||
| 1981 | 148 | 11 | 13 | 8 | 9 | 13 | 5 | 18 | 21 | 19 | 18 | 13 | |
| 1980 | 154 | 3 | 5 | 9 | 25 | 8 | 5 | 18 | 17 | 15 | 15 | 22 | 12 |
| 1979 | 92 | 4 | 1 | 4 | 11 | 9 | 8 | 11 | 10 | 7 | 10 | 13 | 4 |
| 1978 | 54 | 9 | 1 | 9 | 7 | 6 | 3 | 6 | 3 | 1 | 2 | 7 | |
| 1977 | 58 | 2 | 6 | 5 | 7 | 4 | 2 | 4 | 7 | 8 | 6 | 7 | |
| 1976 | 31 | 7 | 4 | 5 | 4 | 2 | 3 | 4 | 2 | ||||
| 1975 | 134 | 6 | 4 | 8 | 12 | 13 | 15 | 10 | 12 | 13 | 26 | 9 | 6 |
| 1974 | 51 | 3 | 7 | 8 | 6 | 6 | 13 | 8 | |||||
| 1307 |
