| Year | Count |
|---|---|
| 1941 | 7 |
| 1948 | 5 |
| 1949 | 5 |
| 1950 | 10 |
| 1951 | 19 |
| 1952 | 19 |
| 1953 | 21 |
| 1954 | 22 |
| 1955 | 30 |
| 1956 | 14 |
| 1957 | 38 |
| 1958 | 32 |
| 1959 | 22 |
| 1960 | 38 |
| 1961 | 28 |
| 1963 | 8 |
| 1964 | 17 |
| 1965 | 10 |
| 1966 | 13 |
| 1967 | 8 |
| 1968 | 11 |
| 1969 | 14 |
| 1970 | 10 |
| 1971 | 10 |
| 1973 | 6 |
| 1974 | 5 |
| 1975 | 7 |
| 1976 | 14 |
| 1979 | 10 |
| 1981 | 8 |
| 1984 | 6 |
| 1985 | 6 |
| 1986 | 6 |
| 1989 | 6 |