| Year | Count |
|---|---|
| 1917 | 10 |
| 1922 | 12 |
| 1934 | 18 |
| 1991 | 5 |
| 1992 | 10 |
| 1993 | 6 |
| 1994 | 50 |
| 1995 | 45 |
| 1996 | 63 |
| 1997 | 50 |
| 1998 | 107 |
| 1999 | 86 |
| 2000 | 102 |
| 2001 | 77 |
| 2002 | 68 |
| 2003 | 112 |
| 2004 | 152 |
| 2005 | 247 |
| 2006 | 196 |
| 2007 | 204 |
| 2008 | 251 |
| 2009 | 148 |
| 2010 | 176 |
| 2011 | 202 |
| 2012 | 225 |
| 2013 | 236 |
| 2014 | 266 |
| 2015 | 338 |
| 2016 | 527 |
| 2017 | 534 |
| 2018 | 458 |
| 2019 | 385 |
| 2020 | 363 |
| 2021 | 345 |
| 2022 | 290 |
| 2023 | 288 |
| 2024 | 266 |