| Year | Count |
|---|---|
| 1941 | 10 |
| 1943 | 15 |
| 1946 | 21 |
| 1952 | 6 |
| 1953 | 5 |
| 1954 | 6 |
| 1955 | 17 |
| 1956 | 5 |
| 1958 | 7 |
| 1961 | 8 |
| 1961 | 12 |
| 1967 | 6 |
| 1969 | 13 |
| 1970 | 28 |
| 1971 | 27 |
| 1972 | 61 |
| 1973 | 62 |
| 1973 | 14 |
| 1974 | 36 |
| 1975 | 10 |
| 1976 | 28 |
| 1977 | 17 |
| 1978 | 25 |
| 1979 | 62 |
| 1980 | 33 |
| 1981 | 24 |
| 1982 | 20 |
| 1983 | 42 |
| 1984 | 24 |
| 1985 | 50 |
| 1986 | 27 |
| 1987 | 16 |
| 1988 | 10 |
| 1989 | 10 |
| 1990 | 6 |
| 1991 | 5 |