| Year | Count |
|---|---|
| 1917 | 5 |
| 1922 | 6 |
| 1925 | 6 |
| 1934 | 5 |
| 1937 | 5 |
| 1941 | 7 |
| 1943 | 5 |
| 1945 | 5 |
| 1947 | 5 |
| 1948 | 5 |
| 1951 | 6 |
| 1956 | 5 |
| 1961 | 5 |
| 1969 | 5 |
| 1973 | 5 |
| 1980 | 5 |
| 1981 | 5 |
| 1993 | 5 |
| 1995 | 8 |
| 1996 | 7 |
| 1997 | 7 |
| 1998 | 8 |
| 1999 | 7 |
| 2001 | 6 |
| 2004 | 6 |
| 2005 | 14 |
| 2007 | 6 |
| 2008 | 9 |
| 2009 | 6 |
| 2010 | 9 |
| 2012 | 9 |
| 2014 | 6 |
| 2015 | 14 |
| 2017 | 12 |
| 2018 | 10 |
| 2019 | 5 |
| 2023 | 9 |