| Year | Count |
|---|---|
| 1949 | 5 |
| 1952 | 5 |
| 1952 | 32 |
| 1953 | 17 |
| 1954 | 6 |
| 1954 | 5 |
| 1955 | 8 |
| 1955 | 29 |
| 1956 | 7 |
| 1956 | 36 |
| 1957 | 16 |
| 1957 | 51 |
| 1958 | 40 |
| 1959 | 12 |
| 1960 | 9 |
| 1960 | 15 |
| 1961 | 15 |
| 1961 | 6 |
| 1962 | 5 |
| 1963 | 8 |
| 1965 | 14 |
| 1967 | 12 |
| 1968 | 11 |
| 1968 | 5 |
| 1969 | 7 |
| 1970 | 10 |
| 1971 | 10 |
| 1972 | 5 |
| 1973 | 5 |
| 1974 | 7 |
| 1977 | 5 |
| 1980 | 13 |
| 1983 | 5 |
| 1984 | 5 |
| 1985 | 10 |