| Year | Count |
|---|---|
| 1917 | 5 |
| 1978 | 12 |
| 1989 | 6 |
| 1996 | 6 |
| 1997 | 5 |
| 2000 | 6 |
| 2001 | 11 |
| 2002 | 9 |
| 2003 | 10 |
| 2004 | 8 |
| 2005 | 11 |
| 2006 | 26 |
| 2007 | 43 |
| 2008 | 51 |
| 2009 | 52 |
| 2010 | 49 |
| 2011 | 74 |
| 2012 | 61 |
| 2013 | 55 |
| 2014 | 54 |
| 2015 | 64 |
| 2016 | 156 |
| 2017 | 168 |
| 2018 | 56 |
| 2019 | 146 |
| 2020 | 126 |
| 2021 | 108 |
| 2022 | 134 |
| 2023 | 148 |
| 2024 | 160 |