| Year | Count |
|---|---|
| 1945 | 5 |
| 1946 | 6 |
| 1947 | 26 |
| 1948 | 10 |
| 1949 | 10 |
| 1950 | 20 |
| 1951 | 23 |
| 1952 | 42 |
| 1953 | 37 |
| 1954 | 5 |
| 1955 | 7 |
| 1956 | 10 |
| 1957 | 10 |
| 1958 | 15 |
| 1960 | 12 |
| 1961 | 8 |
| 1966 | 5 |
| 1967 | 10 |
| 1968 | 5 |
| 1969 | 7 |
| 1970 | 9 |
| 1971 | 10 |
| 1972 | 18 |
| 1974 | 9 |
| 1975 | 8 |
| 1976 | 21 |
| 1977 | 51 |
| 1978 | 9 |
| 1979 | 37 |
| 1980 | 32 |
| 1981 | 20 |
| 1982 | 32 |
| 1983 | 11 |
| 1984 | 27 |
| 1985 | 54 |
| 1986 | 18 |
| 1987 | 39 |
| 1988 | 6 |
| 1989 | 12 |
| 1990 | 27 |
| 1991 | 39 |
| 1992 | 18 |
| 1993 | 5 |
| 1994 | 12 |
| 1995 | 8 |
| 1996 | 23 |
| 1997 | 12 |