| Year | Total | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
| 1977 | 30 | 3 | 21 | 6 | |||||||||
| 1976 | 4 | 3 | 1 | ||||||||||
| 1975 | 54 | 6 | 8 | 7 | 2 | 8 | 3 | 4 | 6 | 2 | 4 | 2 | 2 |
| 1974 | 104 | 9 | 11 | 10 | 9 | 8 | 6 | 10 | 7 | 6 | 10 | 9 | 9 |
| 1973 | 27 | 3 | 7 | 10 | 7 | ||||||||
| 1972 | 32 | 4 | 4 | 3 | 6 | 2 | 10 | 3 | |||||
| 1971 | 58 | 6 | 5 | 8 | 7 | 4 | 7 | 3 | 4 | 2 | 9 | 2 | 1 |
| 1970 | 62 | 9 | 9 | 11 | 6 | 9 | 8 | 3 | 1 | 1 | 4 | 1 | |
| 1969 | 67 | 2 | 7 | 6 | 4 | 1 | 3 | 16 | 9 | 12 | 4 | 3 | |
| 1968 | 68 | 8 | 10 | 10 | 12 | 12 | 8 | 7 | 1 | ||||
| 1967 | 90 | 17 | 15 | 17 | 5 | 3 | 4 | 5 | 3 | 1 | 10 | 10 | |
| 1966 | 122 | 17 | 10 | 13 | 21 | 15 | 19 | 13 | 5 | 7 | 1 | 1 | |
| 1965 | 61 | 6 | 7 | 14 | 14 | 9 | 3 | 1 | 3 | 1 | 2 | 1 | |
| 1964 | 72 | 2 | 3 | 1 | 1 | 8 | 9 | 14 | 9 | 9 | 14 | 2 | |
| 1963 | 23 | 1 | 3 | 1 | 1 | 1 | 4 | 3 | 4 | 4 | 1 | ||
| 1962 | 11 | 6 | 1 | 1 | 1 | 2 | |||||||
| 1961 | 132 | 3 | 1 | 1 | 1 | 9 | 19 | 21 | 24 | 27 | 17 | 1 | 8 |
| 1960 | 8 | 1 | 2 | 3 | 2 | ||||||||
| 1959 | 3 | 1 | 1 | 1 | |||||||||
| 1958 | 59 | 9 | 22 | 17 | 1 | 7 | 3 | ||||||
| 1957 | 55 | 3 | 4 | 5 | 7 | 20 | 4 | 3 | 4 | 1 | 4 | ||
| 1956 | 24 | 10 | 14 | ||||||||||
| 1166 |