| Year | Count |
|---|---|
| 1919 | 5 |
| 1973 | 5 |
| 1983 | 5 |
| 1985 | 6 |
| 1987 | 9 |
| 1988 | 7 |
| 1989 | 5 |
| 1990 | 25 |
| 1991 | 14 |
| 1992 | 6 |
| 1993 | 6 |
| 1994 | 6 |
| 1995 | 14 |
| 1996 | 5 |
| 1997 | 8 |
| 1998 | 27 |
| 1999 | 14 |
| 2000 | 15 |
| 2001 | 63 |
| 2002 | 50 |
| 2003 | 75 |
| 2004 | 102 |
| 2005 | 257 |
| 2006 | 805 |
| 2007 | 916 |
| 2008 | 1,418 |
| 2009 | 1,466 |
| 2010 | 1,380 |
| 2011 | 1,404 |
| 2012 | 1,498 |
| 2013 | 1,750 |
| 2014 | 1,442 |
| 2015 | 1,783 |
| 2016 | 1,869 |
| 2017 | 1,499 |
| 2018 | 1,592 |
| 2019 | 1,539 |
| 2020 | 1,323 |
| 2021 | 1,647 |
| 2022 | 1,482 |
| 2023 | 1,199 |
| 2024 | 1,213 |