| Year | Count |
|---|---|
| 1920 | 7 |
| 1921 | 6 |
| 1922 | 10 |
| 1924 | 10 |
| 1926 | 28 |
| 1931 | 7 |
| 1946 | 7 |
| 1948 | 5 |
| 1949 | 5 |
| 1951 | 5 |
| 1957 | 12 |
| 1967 | 5 |
| 1975 | 5 |
| 1977 | 18 |
| 1990 | 5 |
| 1996 | 8 |
| 1998 | 10 |
| 1999 | 5 |
| 2000 | 8 |
| 2001 | 15 |
| 2002 | 10 |
| 2003 | 15 |
| 2004 | 11 |
| 2005 | 7 |
| 2006 | 5 |
| 2007 | 7 |
| 2008 | 7 |
| 2009 | 15 |
| 2010 | 7 |
| 2011 | 7 |
| 2012 | 5 |
| 2013 | 5 |
| 2014 | 11 |
| 2015 | 24 |
| 2018 | 10 |