| Year | Total | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
| 1980 | 1 | 1 | |||||||||||
| 1979 | 2 | 2 | |||||||||||
| 1978 | 28 | 4 | 2 | 9 | 13 | ||||||||
| 1977 | 42 | 6 | 1 | 13 | 5 | 3 | 2 | 3 | 1 | 4 | 4 | ||
| 1976 | 33 | 14 | 1 | 4 | 1 | 3 | 7 | 3 | |||||
| 1975 | 96 | 11 | 4 | 9 | 12 | 10 | 11 | 12 | 5 | 12 | 3 | 5 | 2 |
| 1974 | 136 | 18 | 4 | 11 | 12 | 19 | 10 | 12 | 13 | 13 | 14 | 3 | 7 |
| 1973 | 156 | 13 | 12 | 9 | 18 | 14 | 10 | 17 | 10 | 10 | 21 | 11 | 11 |
| 1972 | 102 | 16 | 1 | 4 | 25 | 15 | 2 | 6 | 2 | 9 | 7 | 15 | |
| 1971 | 123 | 17 | 2 | 5 | 19 | 16 | 19 | 1 | 15 | 8 | 16 | 5 | |
| 1970 | 125 | 13 | 7 | 9 | 16 | 11 | 16 | 19 | 12 | 9 | 8 | 5 | |
| 1969 | 141 | 9 | 7 | 12 | 20 | 4 | 13 | 15 | 20 | 11 | 11 | 14 | 5 |
| 1968 | 150 | 18 | 8 | 8 | 10 | 13 | 9 | 13 | 15 | 13 | 12 | 20 | 11 |
| 1967 | 21 | 4 | 7 | 9 | 1 | ||||||||
| 1966 | 1 | 1 | |||||||||||
| 1157 |
