| Year | Count |
|---|---|
| 1997 | 5 |
| 1999 | 10 |
| 2000 | 8 |
| 2001 | 6 |
| 2003 | 11 |
| 2004 | 25 |
| 2005 | 31 |
| 2006 | 40 |
| 2007 | 91 |
| 2008 | 168 |
| 2009 | 236 |
| 2010 | 262 |
| 2011 | 340 |
| 2012 | 14 |
| 2012 | 546 |
| 2013 | 609 |
| 2014 | 792 |
| 2015 | 957 |
| 2016 | 1,259 |
| 2017 | 1,308 |
| 2018 | 1,332 |
| 2019 | 1,402 |
| 2020 | 1,371 |
| 2021 | 1,609 |
| 2022 | 1,545 |
| 2023 | 1,411 |
| 2024 | 1,350 |