| Year | Count |
|---|---|
| 1921 | 5 |
| 1979 | 5 |
| 1981 | 5 |
| 1982 | 5 |
| 1984 | 7 |
| 1986 | 8 |
| 1987 | 7 |
| 1988 | 9 |
| 1990 | 9 |
| 1991 | 5 |
| 1992 | 9 |
| 1993 | 8 |
| 1994 | 6 |
| 1995 | 5 |
| 1996 | 9 |
| 1997 | 7 |
| 1998 | 15 |
| 1999 | 11 |
| 2000 | 19 |
| 2001 | 19 |
| 2002 | 16 |
| 2003 | 17 |
| 2004 | 27 |
| 2005 | 23 |
| 2006 | 27 |
| 2007 | 37 |
| 2008 | 43 |
| 2009 | 37 |
| 2010 | 26 |
| 2011 | 41 |
| 2012 | 58 |
| 2013 | 46 |
| 2014 | 41 |
| 2015 | 61 |
| 2016 | 90 |
| 2017 | 128 |
| 2018 | 112 |
| 2019 | 136 |
| 2020 | 83 |
| 2021 | 90 |
| 2022 | 69 |
| 2023 | 97 |
| 2024 | 98 |