| Year | Count |
|---|---|
| 1944 | 5 |
| 1946 | 8 |
| 1947 | 65 |
| 1948 | 23 |
| 1949 | 31 |
| 1950 | 34 |
| 1951 | 67 |
| 1952 | 15 |
| 1953 | 54 |
| 1954 | 49 |
| 1955 | 54 |
| 1956 | 22 |
| 1957 | 48 |
| 1958 | 32 |
| 1959 | 26 |
| 1960 | 14 |
| 1963 | 10 |
| 1964 | 38 |
| 1965 | 24 |
| 1967 | 12 |
| 1968 | 12 |
| 1969 | 22 |
| 1970 | 17 |
| 1971 | 17 |
| 1972 | 5 |
| 1973 | 19 |
| 1974 | 6 |
| 1975 | 14 |
| 1976 | 12 |
| 1977 | 5 |
| 1978 | 9 |
| 1979 | 10 |
| 1980 | 25 |
| 1981 | 14 |
| 1982 | 33 |
| 1983 | 22 |
| 1985 | 8 |
| 1987 | 9 |
| 1988 | 15 |
| 1989 | 35 |
| 1990 | 14 |
| 1991 | 7 |
| 1992 | 17 |
| 1993 | 18 |
| 1994 | 7 |
| 1996 | 9 |
| 1997 | 10 |
| 1998 | 8 |
| 1999 | 9 |
| 2000 | 9 |
| 2003 | 17 |
| 2005 | 8 |
| 2007 | 19 |
| 2009 | 5 |
| 2011 | 14 |
| 2012 | 10 |
| 2014 | 12 |
| 2015 | 10 |