| Year | Total | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
| 1970 | 41 | 1 | 9 | 17 | 8 | 3 | 3 | ||||||
| 1969 | 54 | 10 | 15 | 10 | 14 | 5 | |||||||
| 1968 | 40 | 1 | 3 | 13 | 15 | 7 | 1 | ||||||
| 1967 | 63 | 2 | 2 | 4 | 7 | 2 | 3 | 23 | 20 | ||||
| 1966 | 37 | 5 | 5 | 3 | 4 | 1 | 6 | 1 | 1 | 4 | 3 | 4 | |
| 1965 | 165 | 13 | 23 | 25 | 21 | 27 | 23 | 26 | 6 | 1 | |||
| 1964 | 17 | 1 | 1 | 5 | 3 | 3 | 3 | 1 | |||||
| 1963 | 10 | 2 | 1 | 2 | 1 | 1 | 3 | ||||||
| 1962 | 52 | 3 | 1 | 1 | 2 | 1 | 3 | 27 | 10 | 2 | 1 | 1 | |
| 1961 | 69 | 1 | 1 | 1 | 27 | 29 | 7 | 2 | 1 | ||||
| 1960 | 7 | 1 | 1 | 3 | 1 | 1 | |||||||
| 1959 | 45 | 7 | 6 | 7 | 5 | 9 | 5 | 2 | 2 | 2 | |||
| 1958 | 25 | 6 | 1 | 2 | 3 | 2 | 2 | 1 | 4 | 1 | 3 | ||
| 1957 | 24 | 1 | 3 | 3 | 1 | 1 | 2 | 3 | 5 | 5 | |||
| 1956 | 7 | 1 | 1 | 1 | 1 | 1 | 2 | ||||||
| 656 |
