| Year | Total | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
| 1981 | 8 | 1 | 2 | 3 | 1 | 1 | |||||||
| 1980 | 16 | 3 | 6 | 2 | 2 | 2 | 1 | ||||||
| 1979 | 16 | 4 | 3 | 1 | 3 | 1 | 1 | 1 | 2 | ||||
| 1978 | 18 | 2 | 2 | 1 | 3 | 2 | 1 | 3 | 4 | ||||
| 1977 | 35 | 1 | 2 | 3 | 3 | 2 | 9 | 2 | 1 | 3 | 3 | 3 | 3 |
| 1976 | 45 | 14 | 1 | 1 | 2 | 4 | 10 | 11 | 1 | 1 | |||
| 1975 | 74 | 12 | 7 | 5 | 10 | 13 | 13 | 4 | 10 | ||||
| 1974 | 175 | 15 | 17 | 16 | 14 | 15 | 18 | 20 | 14 | 9 | 17 | 11 | 9 |
| 1973 | 199 | 18 | 12 | 20 | 23 | 18 | 17 | 17 | 20 | 11 | 20 | 14 | 9 |
| 1972 | 119 | 6 | 5 | 7 | 7 | 3 | 3 | 14 | 13 | 15 | 12 | 19 | 15 |
| 1971 | 155 | 18 | 11 | 11 | 13 | 16 | 17 | 15 | 14 | 14 | 14 | 6 | 6 |
| 1970 | 159 | 16 | 14 | 18 | 13 | 14 | 9 | 4 | 9 | 14 | 17 | 23 | 8 |
| 1969 | 153 | 15 | 13 | 7 | 10 | 9 | 12 | 18 | 17 | 11 | 11 | 17 | 13 |
| 1968 | 167 | 11 | 15 | 13 | 13 | 14 | 15 | 12 | 13 | 11 | 23 | 14 | 13 |
| 1967 | 80 | 7 | 4 | 5 | 4 | 9 | 10 | 6 | 6 | 4 | 5 | 10 | 10 |
| 1966 | 95 | 4 | 4 | 5 | 4 | 6 | 12 | 18 | 13 | 5 | 4 | 6 | 14 |
| 1965 | 176 | 12 | 19 | 17 | 21 | 24 | 14 | 17 | 12 | 7 | 7 | 11 | 15 |
| 1964 | 120 | 9 | 13 | 8 | 15 | 13 | 3 | 10 | 9 | 13 | 7 | 11 | 9 |
| 1963 | 161 | 10 | 10 | 7 | 18 | 17 | 19 | 21 | 21 | 4 | 17 | 9 | 8 |
| 1962 | 97 | 4 | 7 | 10 | 8 | 5 | 10 | 10 | 12 | 5 | 9 | 9 | 8 |
| 1961 | 91 | 11 | 8 | 9 | 18 | 13 | 8 | 9 | 4 | 2 | 4 | 4 | 1 |
| 1960 | 83 | 13 | 12 | 2 | 4 | 4 | 4 | 4 | 5 | 6 | 9 | 11 | 9 |
| 1959 | 158 | 15 | 6 | 8 | 13 | 10 | 9 | 17 | 17 | 22 | 21 | 9 | 11 |
| 1958 | 69 | 20 | 10 | 9 | 4 | 1 | 2 | 8 | 6 | 5 | 4 | ||
| 1957 | 54 | 1 | 1 | 2 | 2 | 1 | 4 | 2 | 4 | 9 | 18 | 10 | |
| 1956 | 3 | 1 | 2 | ||||||||||
| 2526 |
