| Year | Count |
|---|---|
| 1920 | 10 |
| 1922 | 14 |
| 1961 | 5 |
| 1962 | 5 |
| 1963 | 12 |
| 1998 | 14 |
| 1999 | 6 |
| 2000 | 22 |
| 2001 | 12 |
| 2002 | 60 |
| 2003 | 89 |
| 2004 | 156 |
| 2005 | 215 |
| 2006 | 340 |
| 2007 | 414 |
| 2008 | 569 |
| 2009 | 596 |
| 2010 | 757 |
| 2011 | 1,859 |
| 2012 | 2,786 |
| 2013 | 3,620 |
| 2014 | 3,945 |
| 2015 | 5,060 |
| 2016 | 5,686 |
| 2017 | 6,924 |
| 2018 | 9,036 |
| 2019 | 7,765 |
| 2020 | 6,785 |
| 2021 | 7,219 |
| 2022 | 7,544 |
| 2023 | 6,839 |
| 2024 | 6,175 |