| Year | Total | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
| 1980 | 3 | 1 | 1 | 1 | |||||||||
| 1979 | 7 | 1 | 2 | 1 | 1 | 2 | |||||||
| 1978 | 51 | 1 | 2 | 1 | 2 | 3 | 1 | 1 | 3 | 1 | 14 | 13 | 9 |
| 1977 | 10 | 1 | 1 | 1 | 1 | 3 | 1 | 1 | 1 | ||||
| 1976 | 15 | 2 | 2 | 1 | 1 | 2 | 1 | 3 | 3 | ||||
| 1975 | 10 | 1 | 2 | 3 | 1 | 3 | |||||||
| 1974 | 19 | 3 | 2 | 3 | 4 | 2 | 2 | 2 | 1 | ||||
| 1973 | 20 | 2 | 2 | 4 | 3 | 2 | 3 | 1 | 3 | ||||
| 1972 | 11 | 6 | 2 | 2 | 1 | ||||||||
| 1971 | 60 | 4 | 2 | 4 | 7 | 5 | 11 | 11 | 11 | 5 | |||
| 1970 | 34 | 1 | 4 | 3 | 6 | 8 | 8 | 1 | 2 | 1 | |||
| 1969 | 37 | 1 | 1 | 1 | 2 | 5 | 13 | 9 | 5 | ||||
| 1968 | 48 | 1 | 6 | 8 | 7 | 10 | 8 | 3 | 1 | 1 | 1 | 2 | |
| 1967 | 88 | 5 | 5 | 6 | 7 | 6 | 5 | 10 | 10 | 12 | 13 | 8 | 1 |
| 1966 | 75 | 16 | 14 | 18 | 16 | 5 | 4 | 1 | 1 | ||||
| 1965 | 146 | 5 | 7 | 4 | 13 | 16 | 16 | 20 | 16 | 17 | 12 | 15 | 5 |
| 1964 | 53 | 13 | 11 | 3 | 2 | 2 | 6 | 3 | 1 | 3 | 5 | 4 | |
| 1963 | 94 | 6 | 6 | 12 | 5 | 3 | 6 | 13 | 14 | 11 | 9 | 9 | |
| 1962 | 73 | 4 | 4 | 6 | 6 | 4 | 1 | 3 | 3 | 10 | 16 | 10 | 6 |
| 1961 | 90 | 3 | 7 | 12 | 9 | 8 | 11 | 5 | 4 | 11 | 11 | 6 | 3 |
| 1960 | 102 | 4 | 9 | 7 | 13 | 9 | 12 | 14 | 15 | 9 | 7 | 1 | 2 |
| 1959 | 110 | 2 | 1 | 1 | 3 | 9 | 13 | 16 | 17 | 13 | 15 | 15 | 5 |
| 1958 | 87 | 13 | 11 | 14 | 2 | 16 | 14 | 12 | 5 | ||||
| 1957 | 34 | 6 | 5 | 6 | 3 | 2 | 1 | 11 | |||||
| 1956 | 3 | 2 | 1 | ||||||||||
| 1955 | 34 | 1 | 2 | 2 | 10 | 5 | 1 | 7 | 6 | ||||
| 1954 | 22 | 3 | 3 | 8 | 3 | 2 | 3 | ||||||
| 1953 | 35 | 1 | 1 | 1 | 1 | 5 | 10 | 10 | 6 | ||||
| 1952 | 75 | 9 | 1 | 4 | 3 | 1 | 6 | 8 | 16 | 8 | 9 | 10 | |
| 1951 | 23 | 3 | 4 | 8 | 8 | ||||||||
| 1469 |