| Year | Count |
|---|---|
| 1945 | 5 |
| 1951 | 8 |
| 1952 | 9 |
| 1953 | 6 |
| 1954 | 7 |
| 1955 | 18 |
| 1956 | 17 |
| 1957 | 50 |
| 1958 | 38 |
| 1959 | 52 |
| 1960 | 64 |
| 1961 | 50 |
| 1963 | 31 |
| 1964 | 31 |
| 1965 | 30 |
| 1966 | 34 |
| 1967 | 38 |
| 1968 | 33 |
| 1969 | 24 |
| 1970 | 36 |
| 1971 | 27 |
| 1972 | 28 |
| 1973 | 16 |
| 1974 | 15 |
| 1975 | 6 |
| 1976 | 13 |
| 1977 | 26 |
| 1978 | 28 |
| 1981 | 7 |
| 1982 | 5 |
| 1985 | 9 |
| 1986 | 6 |
| 1988 | 5 |
| 1989 | 9 |
| 1990 | 7 |
| 1994 | 6 |
| 1995 | 8 |
| 1996 | 6 |