| Year | Count |
|---|---|
| 1933 | 8 |
| 1934 | 15 |
| 1935 | 24 |
| 1937 | 7 |
| 1942 | 5 |
| 1944 | 5 |
| 1945 | 10 |
| 1946 | 5 |
| 1947 | 40 |
| 1949 | 10 |
| 1950 | 10 |
| 1951 | 6 |
| 1952 | 5 |
| 1953 | 11 |
| 1954 | 9 |
| 1955 | 24 |
| 1956 | 22 |
| 1957 | 7 |
| 1958 | 5 |
| 1959 | 6 |
| 1960 | 12 |
| 1963 | 5 |
| 1964 | 7 |
| 1966 | 5 |
| 1967 | 5 |
| 1968 | 15 |
| 1969 | 5 |
| 1970 | 6 |
| 1972 | 6 |
| 1973 | 6 |
| 1975 | 18 |
| 1978 | 10 |
| 1979 | 17 |
| 1980 | 5 |
| 1981 | 12 |
| 1982 | 9 |
| 1983 | 11 |
| 1984 | 5 |
| 1985 | 16 |
| 1986 | 24 |
| 1987 | 12 |
| 1988 | 11 |
| 1992 | 27 |
| 1993 | 5 |
| 1996 | 7 |
| 1997 | 7 |
| 1998 | 5 |
| 2002 | 10 |
| 2003 | 12 |
| 2004 | 32 |
| 2005 | 12 |
| 2006 | 8 |
| 2007 | 6 |
| 2008 | 8 |
| 2011 | 7 |