| Year | Total | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
| 1981 | 5 | 4 | 1 | ||||||||||
| 1980 | 34 | 1 | 5 | 7 | 1 | 14 | 6 | ||||||
| 1979 | 7 | 1 | 2 | 2 | 1 | 1 | |||||||
| 1978 | 25 | 1 | 5 | 5 | 2 | 2 | 4 | 5 | 1 | ||||
| 1977 | 11 | 1 | 4 | 2 | 1 | 1 | 1 | 1 | |||||
| 1976 | 55 | 13 | 11 | 8 | 7 | 1 | 4 | 3 | 2 | 2 | 2 | 2 | |
| 1975 | 97 | 4 | 4 | 7 | 4 | 1 | 3 | 14 | 15 | 15 | 17 | 13 | |
| 1974 | 50 | 5 | 5 | 5 | 5 | 3 | 3 | 8 | 5 | 5 | 6 | ||
| 1973 | 89 | 11 | 15 | 10 | 6 | 2 | 5 | 6 | 4 | 5 | 7 | 7 | 11 |
| 1972 | 98 | 7 | 10 | 10 | 15 | 16 | 8 | 7 | 5 | 4 | 6 | 4 | 6 |
| 1971 | 44 | 2 | 6 | 6 | 2 | 4 | 4 | 2 | 3 | 6 | 2 | 7 | |
| 1970 | 42 | 7 | 4 | 1 | 2 | 5 | 4 | 6 | 4 | 5 | 4 | ||
| 1969 | 92 | 15 | 13 | 12 | 10 | 14 | 4 | 2 | 3 | 5 | 6 | 4 | 4 |
| 1968 | 85 | 6 | 6 | 2 | 3 | 4 | 2 | 11 | 12 | 8 | 16 | 15 | |
| 1967 | 30 | 5 | 1 | 1 | 2 | 4 | 6 | 1 | 2 | 1 | 1 | 6 | |
| 1966 | 43 | 3 | 4 | 6 | 6 | 5 | 5 | 1 | 4 | 5 | 4 | ||
| 1965 | 61 | 3 | 10 | 11 | 12 | 11 | 2 | 6 | 1 | 1 | 2 | 2 | |
| 1964 | 37 | 2 | 1 | 2 | 11 | 4 | 1 | 4 | 1 | 2 | 2 | 5 | 2 |
| 1963 | 38 | 10 | 1 | 1 | 3 | 6 | 7 | 1 | 4 | 3 | 2 | ||
| 1962 | 88 | 16 | 16 | 11 | 9 | 5 | 12 | 3 | 3 | 9 | 4 | ||
| 1961 | 23 | 3 | 7 | 6 | 4 | 2 | 1 | ||||||
| 1960 | 148 | 4 | 5 | 19 | 22 | 20 | 14 | 14 | 19 | 14 | 10 | 6 | 1 |
| 1959 | 41 | 5 | 4 | 4 | 6 | 15 | 7 | ||||||
| 1958 | 37 | 1 | 1 | 5 | 3 | 5 | 2 | 4 | 3 | 6 | 7 | ||
| 1957 | 20 | 3 | 10 | 3 | 3 | 1 | |||||||
| 1300 |