| Year | Total | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
| 1988 | 1 | 1 | |||||||||||
| 1987 | 1 | 1 | |||||||||||
| 1986 | 1 | 1 | |||||||||||
| 1985 | 17 | 2 | 1 | 2 | 2 | 1 | 4 | 2 | 2 | 1 | |||
| 1984 | 21 | 2 | 1 | 2 | 3 | 2 | 2 | 2 | 2 | 1 | 2 | 2 | |
| 1983 | 31 | 4 | 4 | 2 | 1 | 4 | 5 | 2 | 2 | 3 | 3 | 1 | |
| 1982 | 47 | 3 | 4 | 4 | 5 | 2 | 5 | 3 | 7 | 4 | 1 | 7 | 2 |
| 1981 | 37 | 3 | 3 | 3 | 4 | 3 | 4 | 1 | 4 | 5 | 3 | 2 | 2 |
| 1980 | 47 | 2 | 2 | 10 | 4 | 3 | 3 | 4 | 3 | 2 | 10 | 4 | |
| 1979 | 45 | 2 | 4 | 5 | 6 | 2 | 6 | 4 | 3 | 2 | 4 | 3 | 4 |
| 1978 | 46 | 3 | 2 | 6 | 3 | 3 | 3 | 5 | 5 | 1 | 2 | 6 | 7 |
| 1977 | 61 | 4 | 4 | 6 | 7 | 6 | 4 | 5 | 5 | 5 | 7 | 3 | 5 |
| 1976 | 61 | 10 | 4 | 3 | 7 | 3 | 3 | 6 | 8 | 4 | 5 | 2 | 6 |
| 1975 | 48 | 3 | 6 | 3 | 7 | 3 | 4 | 1 | 5 | 4 | 5 | 7 | |
| 1974 | 55 | 5 | 3 | 7 | 4 | 5 | 2 | 4 | 5 | 3 | 4 | 8 | 5 |
| 1973 | 40 | 2 | 4 | 5 | 2 | 4 | 3 | 3 | 6 | 3 | 6 | 2 | |
| 1972 | 63 | 5 | 8 | 9 | 5 | 4 | 3 | 4 | 5 | 5 | 3 | 9 | 3 |
| 1971 | 55 | 3 | 5 | 4 | 3 | 2 | 6 | 4 | 7 | 3 | 5 | 8 | 5 |
| 1970 | 49 | 4 | 4 | 4 | 4 | 5 | 4 | 3 | 7 | 6 | 2 | 3 | 3 |
| 1969 | 67 | 10 | 7 | 7 | 3 | 4 | 4 | 7 | 7 | 4 | 3 | 6 | 5 |
| 1968 | 64 | 2 | 11 | 5 | 2 | 5 | 4 | 7 | 3 | 9 | 6 | 6 | 4 |
| 1967 | 69 | 5 | 5 | 7 | 3 | 3 | 5 | 7 | 6 | 7 | 8 | 7 | 6 |
| 1966 | 98 | 8 | 11 | 10 | 7 | 9 | 9 | 5 | 6 | 6 | 6 | 12 | 9 |
| 1965 | 88 | 12 | 9 | 9 | 8 | 4 | 7 | 4 | 7 | 4 | 11 | 7 | 6 |
| 1964 | 146 | 10 | 13 | 10 | 16 | 18 | 13 | 13 | 12 | 14 | 10 | 10 | 7 |
| 1963 | 93 | 6 | 8 | 12 | 14 | 11 | 3 | 3 | 4 | 5 | 8 | 7 | 12 |
| 1962 | 51 | 4 | 4 | 2 | 1 | 4 | 2 | 3 | 7 | 6 | 7 | 2 | 9 |
| 1961 | 96 | 13 | 5 | 8 | 6 | 4 | 10 | 9 | 8 | 12 | 6 | 6 | 9 |
| 1960 | 103 | 15 | 11 | 10 | 12 | 12 | 9 | 4 | 5 | 8 | 5 | 4 | 8 |
| 1959 | 60 | 9 | 6 | 7 | 5 | 2 | 2 | 3 | 5 | 4 | 7 | 7 | 3 |
| 1958 | 101 | 10 | 7 | 10 | 8 | 10 | 8 | 7 | 7 | 6 | 12 | 9 | 7 |
| 1957 | 99 | 7 | 11 | 16 | 9 | 4 | 4 | 6 | 7 | 10 | 10 | 5 | 10 |
| 1956 | 72 | 6 | 7 | 9 | 4 | 9 | 9 | 6 | 7 | 4 | 5 | 4 | 2 |
| 1955 | 50 | 3 | 7 | 4 | 5 | 1 | 8 | 1 | 2 | 4 | 9 | 3 | 3 |
| 1954 | 3 | 1 | 2 | ||||||||||
| 1986 |