| Year | Count |
|---|---|
| 1943 | 5 |
| 1944 | 6 |
| 1945 | 5 |
| 1946 | 6 |
| 1947 | 21 |
| 1949 | 5 |
| 1950 | 5 |
| 1953 | 8 |
| 1955 | 11 |
| 1956 | 19 |
| 1957 | 9 |
| 1958 | 9 |
| 1959 | 12 |
| 1960 | 12 |
| 1961 | 8 |
| 1962 | 27 |
| 1963 | 11 |
| 1964 | 9 |
| 1965 | 18 |
| 1966 | 25 |
| 1967 | 8 |
| 1969 | 13 |
| 1970 | 10 |
| 1971 | 12 |
| 1972 | 10 |
| 1973 | 23 |
| 1974 | 16 |
| 1975 | 18 |
| 1977 | 11 |
| 1978 | 48 |
| 1979 | 12 |
| 1980 | 21 |
| 1981 | 38 |
| 1982 | 43 |
| 1983 | 18 |
| 1984 | 42 |
| 1985 | 17 |
| 1986 | 28 |
| 1987 | 15 |
| 1988 | 17 |
| 1989 | 61 |
| 1990 | 42 |
| 1991 | 34 |
| 1992 | 23 |
| 1994 | 8 |
| 1995 | 20 |
| 1996 | 20 |
| 1997 | 12 |
| 1998 | 14 |
| 1999 | 5 |
| 2000 | 12 |
| 2001 | 24 |
| 2002 | 6 |
| 2004 | 15 |
| 2008 | 5 |
| 2011 | 10 |