| Year | Count |
|---|---|
| 1946 | 8 |
| 1948 | 8 |
| 1949 | 5 |
| 1950 | 8 |
| 1951 | 16 |
| 1952 | 29 |
| 1953 | 22 |
| 1954 | 37 |
| 1955 | 38 |
| 1956 | 27 |
| 1957 | 92 |
| 1958 | 88 |
| 1959 | 88 |
| 1960 | 124 |
| 1961 | 116 |
| 1963 | 72 |
| 1964 | 56 |
| 1965 | 65 |
| 1966 | 59 |
| 1967 | 52 |
| 1968 | 51 |
| 1969 | 53 |
| 1970 | 35 |
| 1971 | 40 |
| 1972 | 23 |
| 1973 | 26 |
| 1974 | 19 |
| 1975 | 16 |
| 1976 | 24 |
| 1977 | 26 |
| 1978 | 28 |
| 1979 | 22 |
| 1981 | 7 |
| 1982 | 8 |
| 1985 | 5 |
| 1988 | 5 |
| 1989 | 7 |