| Year | Total | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
| 1988 | 1 | 1 | |||||||||||
| 1987 | - | ||||||||||||
| 1986 | - | ||||||||||||
| 1985 | 1 | 1 | |||||||||||
| 1984 | 151 | 18 | 20 | 17 | 16 | 7 | 5 | 13 | 13 | 7 | 10 | 11 | 14 |
| 1983 | 8 | 1 | 2 | 2 | 2 | 1 | |||||||
| 1982 | 74 | 2 | 4 | 12 | 12 | 16 | 4 | 1 | 8 | 10 | 5 | ||
| 1981 | 87 | 17 | 6 | 11 | 10 | 13 | 2 | 4 | 2 | 7 | 5 | 4 | 6 |
| 1980 | 141 | 11 | 13 | 22 | 15 | 7 | 3 | 14 | 9 | 2 | 15 | 18 | 12 |
| 1979 | 177 | 7 | 8 | 22 | 18 | 19 | 15 | 19 | 15 | 12 | 14 | 16 | 12 |
| 1978 | 54 | 3 | 3 | 3 | 3 | 5 | 2 | 5 | 5 | 8 | 3 | 6 | 8 |
| 1977 | 126 | 12 | 11 | 14 | 19 | 16 | 15 | 19 | 8 | 3 | 2 | 1 | 6 |
| 1976 | 62 | 16 | 7 | 16 | 5 | 10 | 2 | 1 | 1 | 4 | |||
| 1975 | 39 | 5 | 1 | 1 | 5 | 1 | 2 | 3 | 2 | 7 | 6 | 6 | |
| 1974 | 66 | 3 | 1 | 8 | 6 | 3 | 7 | 10 | 3 | 3 | 8 | 8 | 6 |
| 1973 | 54 | 6 | 6 | 9 | 1 | 5 | 5 | 5 | 6 | 3 | 2 | 1 | 5 |
| 1972 | 75 | 5 | 6 | 8 | 7 | 4 | 10 | 9 | 5 | 6 | 2 | 6 | 7 |
| 1971 | 83 | 5 | 3 | 6 | 5 | 4 | 7 | 9 | 7 | 8 | 12 | 9 | 8 |
| 1970 | 108 | 10 | 15 | 14 | 7 | 6 | 8 | 10 | 8 | 10 | 5 | 6 | 9 |
| 1969 | 55 | 8 | 7 | 8 | 10 | 9 | 7 | 6 | |||||
| 1968 | 56 | 1 | 15 | 11 | 6 | 6 | 13 | 4 | |||||
| 1967 | 48 | 5 | 5 | 8 | 9 | 13 | 6 | 2 | |||||
| 1966 | 67 | 5 | 15 | 13 | 17 | 12 | 5 | ||||||
| 1965 | 70 | 11 | 12 | 12 | 11 | 12 | 12 | ||||||
| 1964 | 62 | 5 | 16 | 9 | 4 | 8 | 11 | 9 | |||||
| 1963 | 56 | 4 | 8 | 8 | 11 | 16 | 7 | 2 | |||||
| 1721 |
