| Year | Count |
|---|---|
| 1914 | 10 |
| 1915 | 10 |
| 1921 | 6 |
| 1922 | 10 |
| 1923 | 5 |
| 1935 | 5 |
| 1951 | 5 |
| 1985 | 24 |
| 1987 | 30 |
| 1988 | 20 |
| 1989 | 27 |
| 1990 | 22 |
| 1991 | 78 |
| 1992 | 97 |
| 1993 | 126 |
| 1994 | 186 |
| 1995 | 81 |
| 1996 | 110 |
| 1997 | 180 |
| 1998 | 201 |
| 1999 | 277 |
| 2000 | 294 |
| 2001 | 362 |
| 2002 | 511 |
| 2003 | 860 |
| 2004 | 1,259 |
| 2005 | 1,949 |
| 2006 | 1,852 |
| 2007 | 2,502 |
| 2008 | 3,620 |
| 2009 | 2,640 |
| 2010 | 3,020 |
| 2011 | 4,573 |
| 2012 | 4,355 |
| 2013 | 3,658 |
| 2014 | 3,770 |
| 2015 | 4,899 |
| 2016 | 6,164 |
| 2017 | 7,008 |
| 2018 | 7,001 |
| 2019 | 7,080 |
| 2020 | 7,071 |
| 2021 | 7,784 |
| 2022 | 8,029 |
| 2023 | 7,558 |
| 2024 | 7,351 |