| Year | Total | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
| 1991 | 9 | 5 | 3 | 1 | |||||||||
| 1990 | 30 | 3 | 1 | 6 | 1 | 5 | 14 | ||||||
| 1989 | 3 | 1 | 1 | 1 | |||||||||
| 1988 | 26 | 1 | 2 | 12 | 6 | 4 | 1 | ||||||
| 1987 | 4 | 2 | 1 | 1 | |||||||||
| 1986 | 17 | 2 | 1 | 2 | 3 | 6 | 3 | ||||||
| 1985 | 32 | 3 | 2 | 3 | 3 | 6 | 3 | 2 | 2 | 1 | 3 | 4 | |
| 1984 | 69 | 6 | 4 | 4 | 4 | 11 | 16 | 5 | 5 | 5 | 3 | 6 | |
| 1983 | 79 | 7 | 6 | 9 | 5 | 2 | 4 | 8 | 1 | 7 | 14 | 9 | 7 |
| 1982 | 123 | 12 | 13 | 9 | 14 | 9 | 6 | 6 | 10 | 10 | 17 | 9 | 8 |
| 1981 | 90 | 8 | 6 | 8 | 4 | 3 | 7 | 22 | 2 | 5 | 14 | 5 | 6 |
| 1980 | 100 | 6 | 9 | 13 | 13 | 5 | 10 | 5 | 4 | 6 | 11 | 11 | 7 |
| 1979 | 24 | 3 | 1 | 3 | 1 | 1 | 5 | 6 | 4 | ||||
| 1978 | 23 | 2 | 5 | 2 | 3 | 1 | 1 | 2 | 2 | 1 | 3 | 1 | |
| 1977 | 34 | 2 | 4 | 10 | 2 | 4 | 4 | 1 | 1 | 4 | 2 | ||
| 1976 | 55 | 9 | 8 | 5 | 8 | 3 | 6 | 4 | 3 | 2 | 2 | 3 | 2 |
| 1975 | 89 | 2 | 6 | 5 | 9 | 11 | 12 | 8 | 10 | 5 | 10 | 1 | 10 |
| 1974 | 55 | 5 | 5 | 4 | 2 | 4 | 2 | 2 | 2 | 8 | 6 | 11 | 4 |
| 1973 | 27 | 1 | 3 | 1 | 1 | 1 | 1 | 4 | 3 | 2 | 5 | 5 | |
| 1972 | 34 | 3 | 5 | 5 | 4 | 3 | 1 | 4 | 2 | 3 | 1 | 2 | 1 |
| 1971 | 68 | 1 | 1 | 4 | 2 | 9 | 3 | 15 | 9 | 10 | 3 | 6 | 5 |
| 1970 | 12 | 3 | 1 | 3 | 1 | 1 | 1 | 2 | |||||
| 1969 | 10 | 2 | 2 | 1 | 1 | 2 | 1 | 1 | |||||
| 1968 | 2 | 1 | 1 | ||||||||||
| 1967 | 3 | 1 | 1 | 1 | |||||||||
| 1966 | 1 | 1 | |||||||||||
| 1019 |
