| Year | Count |
|---|---|
| 1946 | 5 |
| 1947 | 6 |
| 1948 | 25 |
| 1949 | 7 |
| 1950 | 15 |
| 1951 | 33 |
| 1952 | 19 |
| 1953 | 11 |
| 1954 | 8 |
| 1955 | 5 |
| 1956 | 8 |
| 1957 | 10 |
| 1958 | 15 |
| 1959 | 14 |
| 1960 | 28 |
| 1961 | 27 |
| 1962 | 19 |
| 1963 | 12 |
| 1965 | 5 |
| 1967 | 6 |
| 1968 | 33 |
| 1969 | 15 |
| 1970 | 22 |
| 1971 | 5 |
| 1972 | 11 |
| 1973 | 18 |
| 1974 | 9 |
| 1975 | 5 |
| 1976 | 7 |
| 1981 | 11 |
| 1982 | 6 |
| 1983 | 5 |
| 1987 | 12 |