| Year | Total | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
| 1976 | 1 | 1 | |||||||||||
| 1975 | 1 | 1 | |||||||||||
| 1974 | 2 | 2 | |||||||||||
| 1973 | 52 | 10 | 7 | 8 | 10 | 9 | 1 | 2 | 2 | 1 | 2 | ||
| 1972 | 106 | 8 | 7 | 11 | 5 | 9 | 13 | 10 | 7 | 7 | 8 | 13 | 8 |
| 1971 | 73 | 7 | 10 | 11 | 4 | 4 | 5 | 5 | 2 | 5 | 8 | 7 | 5 |
| 1970 | 57 | 3 | 3 | 1 | 2 | 2 | 9 | 10 | 8 | 4 | 6 | 3 | 6 |
| 1969 | 23 | 5 | 3 | 3 | 1 | 1 | 2 | 2 | 4 | 2 | |||
| 1968 | 17 | 1 | 2 | 1 | 1 | 1 | 1 | 5 | 1 | 4 | |||
| 1967 | 36 | 2 | 3 | 2 | 3 | 2 | 4 | 4 | 5 | 4 | 1 | 3 | 3 |
| 1966 | 65 | 8 | 4 | 6 | 4 | 6 | 7 | 3 | 7 | 3 | 4 | 5 | 8 |
| 1965 | 55 | 10 | 3 | 3 | 4 | 3 | 2 | 7 | 6 | 1 | 7 | 5 | 4 |
| 1964 | 73 | 9 | 8 | 8 | 5 | 4 | 6 | 5 | 6 | 5 | 5 | 9 | 3 |
| 1963 | 33 | 1 | 2 | 4 | 3 | 7 | 7 | 6 | 3 | ||||
| 1962 | 53 | 7 | 1 | 10 | 2 | 6 | 5 | 13 | 6 | 2 | 1 | ||
| 1961 | 22 | 1 | 9 | 3 | 4 | 1 | 2 | 2 | |||||
| 1960 | 39 | 7 | 8 | 5 | 4 | 7 | 6 | 2 | |||||
| 1959 | 73 | 11 | 12 | 4 | 6 | 7 | 8 | 2 | 2 | 4 | 9 | 4 | 4 |
| 1958 | 17 | 1 | 1 | 7 | 8 | ||||||||
| 1957 | 28 | 9 | 4 | 5 | 6 | 4 | |||||||
| 1956 | 18 | 1 | 1 | 7 | 9 | ||||||||
| 1955 | 12 | 1 | 2 | 4 | 5 | ||||||||
| 1954 | 28 | 2 | 1 | 1 | 9 | 8 | 6 | 1 | |||||
| 884 |
