| Year | Total | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
| 1980 | 1 | 1 | |||||||||||
| 1979 | 5 | 1 | 1 | 2 | 1 | ||||||||
| 1978 | 47 | 8 | 4 | 6 | 7 | 3 | 2 | 5 | 6 | 3 | 2 | 1 | |
| 1977 | 131 | 4 | 1 | 14 | 20 | 20 | 15 | 18 | 8 | 25 | 5 | 1 | |
| 1976 | 138 | 3 | 3 | 13 | 15 | 14 | 15 | 17 | 19 | 10 | 13 | 8 | 8 |
| 1975 | 96 | 2 | 3 | 2 | 12 | 14 | 8 | 11 | 9 | 8 | 10 | 13 | 4 |
| 1974 | 103 | 8 | 4 | 6 | 17 | 16 | 7 | 11 | 4 | 19 | 7 | 3 | 1 |
| 1973 | 25 | 2 | 2 | 4 | 3 | 3 | 2 | 4 | 3 | 2 | |||
| 1972 | 109 | 8 | 9 | 11 | 6 | 7 | 14 | 14 | 12 | 9 | 8 | 9 | 2 |
| 1971 | 35 | 3 | 4 | 4 | 4 | 1 | 1 | 2 | 1 | 5 | 6 | 4 | |
| 1970 | 41 | 1 | 10 | 7 | 2 | 7 | 4 | 6 | 1 | 3 | |||
| 1969 | 41 | 6 | 18 | 7 | 3 | 1 | 4 | 2 | |||||
| 1968 | 31 | 1 | 8 | 3 | 3 | 1 | 5 | 1 | 4 | 3 | 2 | ||
| 1967 | 29 | 2 | 2 | 3 | 1 | 1 | 3 | 6 | 6 | 4 | 1 | ||
| 1966 | 54 | 6 | 4 | 5 | 7 | 5 | 7 | 7 | 8 | 3 | 2 | ||
| 1965 | 23 | 1 | 1 | 2 | 7 | 6 | 6 | ||||||
| 1964 | 6 | 1 | 1 | 1 | 1 | 2 | |||||||
| 1963 | 1 | 1 | |||||||||||
| 1962 | 19 | 3 | 2 | 2 | 3 | 1 | 1 | 3 | 2 | 2 | |||
| 1961 | 22 | 1 | 2 | 6 | 2 | 1 | 1 | 2 | 5 | 2 | |||
| 1960 | 15 | 1 | 3 | 1 | 6 | 4 | |||||||
| 1959 | - | ||||||||||||
| 1958 | 3 | 1 | 1 | 1 | |||||||||
| 1957 | 8 | 1 | 1 | 1 | 2 | 3 | |||||||
| 1956 | 9 | 3 | 4 | 1 | 1 | ||||||||
| 1955 | 8 | 2 | 2 | 4 | |||||||||
| 1000 |
