| Year | Count |
|---|---|
| 1934 | 10 |
| 1938 | 7 |
| 1945 | 12 |
| 1947 | 9 |
| 1948 | 8 |
| 1949 | 24 |
| 1950 | 10 |
| 1951 | 16 |
| 1952 | 7 |
| 1953 | 33 |
| 1954 | 30 |
| 1955 | 35 |
| 1956 | 21 |
| 1958 | 47 |
| 1959 | 28 |
| 1960 | 18 |
| 1961 | 8 |
| 1962 | 6 |
| 1963 | 15 |
| 1964 | 11 |
| 1965 | 5 |
| 1966 | 6 |
| 1967 | 10 |
| 1968 | 15 |
| 1969 | 18 |
| 1970 | 47 |
| 1971 | 43 |
| 1972 | 53 |
| 1973 | 22 |
| 1974 | 36 |
| 1975 | 13 |
| 1976 | 28 |
| 1977 | 31 |
| 1978 | 44 |
| 1979 | 32 |
| 1980 | 11 |
| 1981 | 55 |
| 1982 | 29 |
| 1983 | 83 |
| 1984 | 63 |
| 1985 | 47 |
| 1986 | 21 |
| 1987 | 46 |
| 1988 | 28 |
| 1989 | 22 |
| 1990 | 21 |
| 1991 | 22 |
| 1992 | 13 |
| 1993 | 24 |
| 1995 | 19 |
| 1996 | 6 |
| 1997 | 24 |
| 2001 | 5 |
| 2006 | 14 |