| Year | Count |
|---|---|
| 1919 | 5 |
| 1921 | 6 |
| 1924 | 5 |
| 1926 | 5 |
| 1927 | 12 |
| 1961 | 10 |
| 1975 | 5 |
| 1982 | 10 |
| 1983 | 10 |
| 1984 | 10 |
| 1986 | 12 |
| 1987 | 10 |
| 1988 | 5 |
| 1992 | 12 |
| 1996 | 12 |
| 1997 | 10 |
| 1998 | 21 |
| 1999 | 6 |
| 2001 | 17 |
| 2002 | 5 |
| 2003 | 12 |
| 2004 | 38 |
| 2005 | 58 |
| 2006 | 43 |
| 2007 | 41 |
| 2008 | 104 |
| 2009 | 50 |
| 2010 | 31 |
| 2011 | 71 |
| 2012 | 25 |
| 2013 | 43 |
| 2014 | 23 |
| 2015 | 33 |
| 2016 | 26 |
| 2017 | 19 |
| 2018 | 12 |
| 2019 | 7 |
| 2020 | 6 |
| 2021 | 5 |
| 2022 | 5 |
| 2023 | 5 |