| Year | Count |
|---|---|
| 1929 | 12 |
| 1931 | 12 |
| 1932 | 8 |
| 1933 | 10 |
| 1934 | 10 |
| 1935 | 5 |
| 1936 | 14 |
| 1937 | 10 |
| 1938 | 10 |
| 1939 | 8 |
| 1940 | 6 |
| 1941 | 5 |
| 1942 | 8 |
| 1943 | 8 |
| 1944 | 6 |
| 1945 | 8 |
| 1946 | 10 |
| 1947 | 6 |
| 1950 | 6 |
| 1951 | 6 |
| 1953 | 6 |
| 1954 | 6 |
| 1956 | 5 |
| 1957 | 12 |
| 1959 | 16 |
| 1960 | 12 |
| 1963 | 9 |
| 1964 | 6 |
| 1969 | 5 |
| 1970 | 9 |
| 1971 | 13 |
| 1972 | 8 |
| 1975 | 6 |
| 1977 | 10 |
| 1978 | 10 |
| 1982 | 5 |
| 1983 | 7 |
| 1985 | 7 |
| 1986 | 5 |
| 1987 | 6 |
| 1989 | 6 |
| 1990 | 6 |
| 1995 | 10 |
| 1996 | 5 |
| 1997 | 5 |
| 1998 | 6 |
| 2001 | 5 |
| 2003 | 7 |
| 2005 | 5 |
| 2006 | 6 |
| 2009 | 8 |
| 2011 | 7 |
| 2012 | 9 |
| 2013 | 8 |
| 2015 | 15 |