| Year | Total | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
| 1972 | 1 | 1 | |||||||||||
| 1971 | - | ||||||||||||
| 1970 | 1 | 1 | |||||||||||
| 1969 | 15 | 4 | 5 | 4 | 1 | 1 | |||||||
| 1968 | 22 | 1 | 3 | 5 | 3 | 3 | 4 | 3 | |||||
| 1967 | 40 | 1 | 3 | 5 | 7 | 5 | 2 | 6 | 3 | 1 | 3 | 2 | 2 |
| 1966 | 20 | 1 | 3 | 4 | 1 | 2 | 1 | 4 | 1 | 2 | 1 | ||
| 1965 | 28 | 1 | 6 | 7 | 5 | 1 | 2 | 1 | 2 | 3 | |||
| 1964 | 32 | 2 | 5 | 7 | 1 | 1 | 1 | 1 | 11 | 3 | |||
| 1963 | 22 | 1 | 5 | 1 | 1 | 2 | 1 | 3 | 2 | 3 | 3 | ||
| 1962 | 17 | 1 | 1 | 4 | 2 | 5 | 3 | 1 | |||||
| 1961 | 25 | 1 | 3 | 7 | 5 | 7 | 2 | ||||||
| 1960 | 35 | 7 | 1 | 1 | 3 | 3 | 3 | 8 | 1 | 3 | 1 | 4 | |
| 1959 | 34 | 2 | 4 | 6 | 3 | 3 | 6 | 3 | 1 | 4 | 2 | ||
| 1958 | 49 | 8 | 4 | 3 | 8 | 3 | 1 | 3 | 6 | 4 | 6 | 3 | |
| 1957 | 39 | 1 | 2 | 8 | 4 | 6 | 2 | 7 | 2 | 6 | 1 | ||
| 1956 | 27 | 1 | 3 | 2 | 2 | 5 | 1 | 6 | 7 | ||||
| 1955 | 37 | 9 | 1 | 1 | 3 | 8 | 3 | 7 | 5 | ||||
| 1954 | 5 | 5 | |||||||||||
| 1953 | 5 | 1 | 3 | 1 | |||||||||
| 1952 | 18 | 4 | 5 | 2 | 3 | 2 | 2 | ||||||
| 1951 | 13 | 2 | 3 | 3 | 2 | 1 | 1 | 1 | |||||
| 1950 | 7 | 5 | 1 | 1 | |||||||||
| 492 |
