| Year | Count |
|---|---|
| 1997 | 6 |
| 1998 | 18 |
| 1999 | 6 |
| 2000 | 5 |
| 2001 | 30 |
| 2002 | 27 |
| 2003 | 62 |
| 2004 | 85 |
| 2005 | 161 |
| 2006 | 114 |
| 2007 | 134 |
| 2008 | 208 |
| 2009 | 181 |
| 2010 | 196 |
| 2011 | 240 |
| 2012 | 370 |
| 2013 | 374 |
| 2014 | 390 |
| 2015 | 689 |
| 2016 | 1,287 |
| 2017 | 1,218 |
| 2018 | 1,057 |
| 2019 | 917 |
| 2020 | 816 |
| 2021 | 814 |
| 2022 | 819 |
| 2023 | 703 |
| 2024 | 583 |