| Year | Count |
|---|---|
| 1947 | 8 |
| 1949 | 6 |
| 1951 | 5 |
| 1952 | 7 |
| 1953 | 8 |
| 1954 | 19 |
| 1955 | 14 |
| 1956 | 13 |
| 1957 | 38 |
| 1958 | 44 |
| 1959 | 46 |
| 1960 | 32 |
| 1961 | 50 |
| 1963 | 17 |
| 1964 | 11 |
| 1965 | 28 |
| 1966 | 21 |
| 1967 | 19 |
| 1968 | 12 |
| 1969 | 13 |
| 1970 | 10 |
| 1971 | 7 |
| 1972 | 7 |
| 1973 | 13 |
| 1974 | 7 |
| 1976 | 12 |
| 1977 | 18 |
| 1983 | 6 |
| 1984 | 5 |
| 1985 | 7 |
| 1986 | 6 |
| 1988 | 5 |
| 1989 | 5 |