| Year | Count |
|---|---|
| 1917 | 5 |
| 1923 | 5 |
| 1961 | 5 |
| 1976 | 15 |
| 1981 | 18 |
| 1986 | 5 |
| 1987 | 11 |
| 1988 | 27 |
| 1989 | 6 |
| 1990 | 28 |
| 1991 | 17 |
| 1992 | 11 |
| 1993 | 6 |
| 1994 | 17 |
| 1995 | 17 |
| 1996 | 21 |
| 1997 | 16 |
| 1998 | 53 |
| 1999 | 12 |
| 2000 | 37 |
| 2001 | 88 |
| 2002 | 52 |
| 2003 | 97 |
| 2004 | 152 |
| 2005 | 172 |
| 2006 | 205 |
| 2007 | 206 |
| 2008 | 338 |
| 2009 | 234 |
| 2010 | 204 |
| 2011 | 240 |
| 2012 | 355 |
| 2013 | 427 |
| 2014 | 485 |
| 2015 | 576 |
| 2016 | 743 |
| 2017 | 745 |
| 2018 | 878 |
| 2019 | 820 |
| 2020 | 641 |
| 2021 | 770 |
| 2022 | 654 |
| 2023 | 587 |
| 2024 | 641 |