| Year | Count |
|---|---|
| 1919 | 10 |
| 1923 | 5 |
| 1926 | 5 |
| 1928 | 8 |
| 1934 | 8 |
| 1940 | 13 |
| 1941 | 5 |
| 1943 | 8 |
| 1945 | 7 |
| 1948 | 11 |
| 1950 | 6 |
| 1957 | 15 |
| 1962 | 12 |
| 1965 | 12 |
| 1968 | 25 |
| 1969 | 8 |
| 1970 | 7 |
| 1971 | 7 |
| 1973 | 8 |
| 1974 | 12 |
| 1976 | 7 |
| 1977 | 5 |
| 1978 | 9 |
| 1979 | 6 |
| 1980 | 11 |
| 1981 | 7 |
| 1982 | 5 |
| 1983 | 6 |
| 1984 | 20 |
| 1985 | 5 |
| 1988 | 9 |
| 1989 | 7 |
| 1992 | 6 |
| 1993 | 10 |
| 1994 | 8 |
| 1995 | 8 |
| 1996 | 7 |
| 1997 | 10 |
| 1998 | 5 |
| 1999 | 11 |
| 2000 | 14 |
| 2001 | 14 |
| 2003 | 5 |
| 2005 | 19 |
| 2006 | 17 |
| 2007 | 15 |
| 2008 | 5 |
| 2009 | 6 |
| 2010 | 8 |
| 2011 | 26 |
| 2012 | 18 |
| 2013 | 20 |
| 2014 | 12 |
| 2015 | 16 |
| 2016 | 12 |
| 2019 | 5 |
| 2023 | 5 |