| Year | Count |
|---|---|
| 1918 | 5 |
| 1924 | 5 |
| 1925 | 6 |
| 1931 | 16 |
| 1955 | 5 |
| 1983 | 6 |
| 1985 | 7 |
| 1986 | 5 |
| 1987 | 6 |
| 1988 | 12 |
| 1989 | 10 |
| 1990 | 5 |
| 1991 | 12 |
| 1992 | 23 |
| 1993 | 34 |
| 1994 | 67 |
| 1995 | 54 |
| 1996 | 101 |
| 1997 | 88 |
| 1998 | 110 |
| 1999 | 80 |
| 2000 | 208 |
| 2001 | 189 |
| 2002 | 300 |
| 2003 | 252 |
| 2004 | 636 |
| 2005 | 826 |
| 2006 | 581 |
| 2007 | 576 |
| 2008 | 638 |
| 2009 | 764 |
| 2010 | 555 |
| 2011 | 833 |
| 2012 | 757 |
| 2013 | 378 |
| 2014 | 310 |
| 2015 | 502 |
| 2016 | 599 |
| 2017 | 665 |
| 2018 | 478 |
| 2019 | 524 |
| 2020 | 406 |
| 2021 | 416 |
| 2022 | 627 |
| 2023 | 635 |
| 2024 | 521 |