| Year | Count |
|---|---|
| 1946 | 5 |
| 1948 | 6 |
| 1949 | 10 |
| 1950 | 16 |
| 1951 | 24 |
| 1952 | 16 |
| 1953 | 40 |
| 1954 | 29 |
| 1955 | 30 |
| 1956 | 34 |
| 1957 | 92 |
| 1958 | 94 |
| 1959 | 106 |
| 1960 | 112 |
| 1961 | 86 |
| 1963 | 42 |
| 1964 | 26 |
| 1965 | 34 |
| 1966 | 47 |
| 1967 | 37 |
| 1968 | 27 |
| 1969 | 33 |
| 1970 | 24 |
| 1971 | 21 |
| 1972 | 16 |
| 1973 | 22 |
| 1974 | 14 |
| 1975 | 9 |
| 1976 | 10 |
| 1977 | 30 |
| 1978 | 24 |
| 1979 | 38 |
| 1981 | 8 |
| 1982 | 11 |
| 1983 | 5 |
| 1984 | 8 |
| 1986 | 6 |
| 1991 | 6 |
| 1994 | 5 |