| Year | Total | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
| 1991 | 4 | 1 | 1 | 2 | |||||||||
| 1990 | 4 | 2 | 1 | 1 | |||||||||
| 1989 | 14 | 3 | 1 | 1 | 1 | 3 | 1 | 2 | 1 | 1 | |||
| 1988 | 25 | 4 | 4 | 2 | 4 | 4 | 1 | 1 | 2 | 1 | 2 | ||
| 1987 | 54 | 7 | 11 | 15 | 5 | 2 | 2 | 2 | 2 | 2 | 2 | 4 | |
| 1986 | 51 | 5 | 3 | 2 | 7 | 5 | 4 | 6 | 4 | 2 | 3 | 10 | |
| 1985 | 27 | 1 | 5 | 2 | 1 | 2 | 4 | 3 | 2 | 3 | 3 | 1 | |
| 1984 | - | ||||||||||||
| 1983 | 40 | 16 | 12 | 12 | |||||||||
| 1982 | 83 | 11 | 6 | 15 | 17 | 3 | 6 | 8 | 6 | 4 | 4 | 3 | |
| 1981 | 54 | 15 | 2 | 1 | 6 | 9 | 7 | 14 | |||||
| 1980 | 111 | 6 | 13 | 15 | 21 | 10 | 1 | 5 | 6 | 10 | 11 | 10 | 3 |
| 1979 | 52 | 5 | 2 | 5 | 2 | 2 | 3 | 1 | 9 | 3 | 11 | 9 | |
| 1978 | 57 | 2 | 6 | 6 | 14 | 16 | 1 | 1 | 3 | 3 | 5 | ||
| 1977 | 37 | 8 | 5 | 8 | 1 | 1 | 1 | 4 | 4 | 5 | |||
| 1976 | 64 | 9 | 3 | 7 | 4 | 9 | 8 | 1 | 5 | 8 | 7 | 3 | |
| 1975 | 144 | 5 | 8 | 4 | 21 | 16 | 11 | 13 | 12 | 16 | 20 | 12 | 6 |
| 1974 | 65 | 4 | 8 | 6 | 9 | 5 | 3 | 5 | 8 | 12 | 5 | ||
| 1973 | 50 | 1 | 5 | 8 | 6 | 8 | 3 | 7 | 3 | 6 | 3 | ||
| 1972 | 81 | 3 | 18 | 11 | 25 | 19 | 5 | ||||||
| 1017 |
