| Year | Count |
|---|---|
| 1935 | 5 |
| 1939 | 5 |
| 1942 | 5 |
| 1943 | 10 |
| 1944 | 20 |
| 1945 | 19 |
| 1946 | 15 |
| 1947 | 20 |
| 1948 | 22 |
| 1949 | 19 |
| 1950 | 19 |
| 1951 | 25 |
| 1952 | 32 |
| 1953 | 27 |
| 1954 | 31 |
| 1955 | 36 |
| 1956 | 41 |
| 1957 | 76 |
| 1958 | 64 |
| 1959 | 80 |
| 1960 | 54 |
| 1961 | 46 |
| 1963 | 23 |
| 1964 | 19 |
| 1965 | 15 |
| 1966 | 14 |
| 1967 | 13 |
| 1968 | 10 |
| 1969 | 9 |
| 1970 | 14 |
| 1971 | 7 |
| 1972 | 10 |
| 1974 | 7 |
| 1975 | 9 |
| 1976 | 10 |
| 1977 | 14 |
| 1978 | 12 |
| 1979 | 14 |
| 1981 | 7 |
| 1982 | 5 |
| 1984 | 8 |
| 1985 | 7 |
| 1988 | 5 |
| 1993 | 5 |
| 1994 | 5 |