| Year | Total | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
| 1988 | 1 | 1 | |||||||||||
| 1987 | - | ||||||||||||
| 1986 | 9 | 1 | 3 | 1 | 2 | 1 | 1 | ||||||
| 1985 | 35 | 10 | 9 | 7 | 3 | 3 | 3 | ||||||
| 1984 | 102 | 6 | 6 | 5 | 10 | 8 | 13 | 23 | 1 | 1 | 6 | 15 | 8 |
| 1983 | 43 | 9 | 2 | 5 | 6 | 1 | 5 | 2 | 5 | 6 | 2 | ||
| 1982 | 63 | 7 | 5 | 4 | 14 | 1 | 3 | 4 | 9 | 3 | 4 | 8 | 1 |
| 1981 | 17 | 1 | 1 | 3 | 2 | 1 | 1 | 2 | 5 | 1 | |||
| 1980 | 80 | 3 | 2 | 3 | 3 | 2 | 8 | 12 | 14 | 11 | 22 | ||
| 1979 | 59 | 4 | 6 | 2 | 3 | 4 | 3 | 18 | 6 | 8 | 2 | 1 | 2 |
| 1978 | 55 | 4 | 1 | 2 | 2 | 2 | 5 | 8 | 9 | 6 | 8 | 7 | 1 |
| 1977 | 126 | 10 | 7 | 12 | 15 | 10 | 9 | 12 | 9 | 13 | 7 | 14 | 8 |
| 1976 | 83 | 8 | 13 | 4 | 4 | 8 | 9 | 7 | 4 | 1 | 2 | 9 | 14 |
| 1975 | 164 | 3 | 9 | 13 | 16 | 12 | 16 | 16 | 15 | 16 | 20 | 13 | 15 |
| 1974 | 83 | 7 | 8 | 12 | 14 | 7 | 3 | 3 | 6 | 6 | 4 | 6 | 7 |
| 1973 | 91 | 6 | 6 | 9 | 8 | 15 | 13 | 4 | 4 | 7 | 7 | 8 | 4 |
| 1972 | 58 | 5 | 2 | 4 | 7 | 4 | 7 | 2 | 10 | 7 | 5 | 4 | 1 |
| 1971 | 47 | 5 | 12 | 4 | 2 | 1 | 2 | 3 | 11 | 7 | |||
| 1970 | 110 | 13 | 16 | 19 | 12 | 10 | 3 | 1 | 7 | 5 | 7 | 10 | 7 |
| 1969 | 77 | 5 | 5 | 1 | 1 | 5 | 10 | 10 | 8 | 11 | 7 | 9 | 5 |
| 1968 | 52 | 12 | 2 | 5 | 4 | 7 | 6 | 1 | 2 | 1 | 6 | 2 | 4 |
| 1967 | 56 | 1 | 2 | 4 | 3 | 8 | 7 | 5 | 11 | 3 | 3 | 9 | |
| 1966 | 94 | 2 | 4 | 14 | 21 | 11 | 12 | 13 | 8 | 2 | 5 | 1 | 1 |
| 1965 | 27 | 1 | 1 | 4 | 4 | 5 | 5 | 2 | 5 | ||||
| 1964 | 33 | 1 | 1 | 4 | 2 | 2 | 3 | 2 | 5 | 5 | 8 | ||
| 1963 | 2 | 1 | 1 | ||||||||||
| 1962 | - | ||||||||||||
| 1961 | - | ||||||||||||
| 1960 | 1 | 1 | |||||||||||
| 1568 |
