| Year | Count |
|---|---|
| 1935 | 5 |
| 1941 | 7 |
| 1942 | 7 |
| 1944 | 8 |
| 1946 | 5 |
| 1947 | 5 |
| 1964 | 5 |
| 1973 | 6 |
| 1979 | 6 |
| 1980 | 5 |
| 1982 | 7 |
| 1986 | 7 |
| 1990 | 5 |
| 1992 | 5 |
| 1994 | 5 |
| 1995 | 7 |
| 1997 | 6 |
| 2000 | 12 |
| 2001 | 7 |
| 2002 | 6 |
| 2003 | 9 |
| 2004 | 8 |
| 2005 | 5 |
| 2006 | 7 |
| 2007 | 11 |
| 2008 | 15 |
| 2009 | 22 |
| 2010 | 19 |
| 2011 | 20 |
| 2012 | 18 |
| 2013 | 16 |
| 2014 | 13 |
| 2015 | 11 |
| 2016 | 40 |
| 2017 | 20 |
| 2018 | 26 |
| 2019 | 30 |
| 2021 | 6 |
| 2022 | 11 |
| 2023 | 5 |
| 2024 | 5 |