| Year | Count |
|---|---|
| 1946 | 9 |
| 1947 | 43 |
| 1948 | 29 |
| 1949 | 24 |
| 1950 | 16 |
| 1951 | 53 |
| 1952 | 50 |
| 1953 | 32 |
| 1954 | 31 |
| 1955 | 27 |
| 1956 | 38 |
| 1957 | 28 |
| 1958 | 37 |
| 1959 | 38 |
| 1960 | 21 |
| 1961 | 34 |
| 1962 | 5 |
| 1963 | 12 |
| 1966 | 12 |
| 1967 | 8 |
| 1970 | 16 |
| 1971 | 5 |
| 1972 | 5 |
| 1975 | 6 |
| 1976 | 12 |
| 1977 | 5 |
| 1978 | 5 |
| 1979 | 7 |
| 1981 | 24 |
| 1982 | 5 |
| 1983 | 6 |
| 1985 | 10 |
| 1986 | 14 |
| 1987 | 20 |
| 1988 | 10 |
| 1990 | 5 |
| 1996 | 6 |
| 2004 | 12 |