| Year | Count |
|---|---|
| 1939 | 8 |
| 1940 | 9 |
| 1941 | 5 |
| 1943 | 6 |
| 1944 | 8 |
| 1945 | 16 |
| 1946 | 17 |
| 1947 | 48 |
| 1948 | 14 |
| 1949 | 23 |
| 1955 | 78 |
| 1956 | 24 |
| 1957 | 28 |
| 1958 | 30 |
| 1959 | 22 |
| 1960 | 34 |
| 1961 | 19 |
| 1962 | 16 |
| 1963 | 46 |
| 1964 | 26 |
| 1965 | 24 |
| 1966 | 18 |
| 1967 | 30 |
| 1968 | 26 |
| 1969 | 5 |
| 1970 | 7 |
| 1971 | 9 |
| 1972 | 10 |
| 1973 | 5 |
| 1974 | 8 |
| 1975 | 10 |
| 1976 | 5 |
| 1977 | 8 |
| 1978 | 6 |
| 1979 | 12 |
| 1980 | 9 |
| 1981 | 8 |
| 1982 | 8 |
| 1983 | 9 |
| 1985 | 25 |
| 1986 | 5 |
| 1987 | 7 |
| 1988 | 6 |
| 1990 | 5 |
| 1991 | 8 |
| 1999 | 5 |
| 2000 | 8 |
| 2005 | 10 |