| Year | Count |
|---|---|
| 1945 | 12 |
| 1947 | 16 |
| 1948 | 13 |
| 1949 | 21 |
| 1950 | 15 |
| 1951 | 18 |
| 1952 | 10 |
| 1953 | 13 |
| 1954 | 22 |
| 1955 | 32 |
| 1956 | 43 |
| 1957 | 54 |
| 1958 | 73 |
| 1959 | 69 |
| 1960 | 111 |
| 1961 | 95 |
| 1962 | 39 |
| 1963 | 88 |
| 1964 | 68 |
| 1965 | 62 |
| 1966 | 73 |
| 1967 | 28 |
| 1968 | 47 |
| 1969 | 30 |
| 1970 | 12 |
| 1971 | 31 |
| 1972 | 16 |
| 1973 | 15 |
| 1974 | 15 |
| 1975 | 17 |
| 1976 | 15 |
| 1977 | 17 |
| 1978 | 12 |
| 1979 | 48 |
| 1981 | 21 |
| 1982 | 5 |
| 1983 | 21 |
| 1984 | 31 |
| 1985 | 9 |
| 1987 | 7 |
| 1988 | 19 |
| 1989 | 5 |
| 1990 | 19 |
| 1991 | 6 |
| 1992 | 7 |
| 1994 | 5 |
| 1995 | 21 |
| 1998 | 22 |
| 2000 | 5 |
| 2001 | 8 |
| 2002 | 5 |
| 2003 | 17 |
| 2008 | 5 |
| 2014 | 6 |
| 2016 | 18 |