| Year | Count |
|---|---|
| 1997 | 20 |
| 1998 | 26 |
| 1999 | 32 |
| 2000 | 61 |
| 2001 | 85 |
| 2002 | 135 |
| 2003 | 123 |
| 2004 | 164 |
| 2005 | 223 |
| 2006 | 329 |
| 2007 | 311 |
| 2008 | 373 |
| 2009 | 394 |
| 2010 | 448 |
| 2011 | 552 |
| 2012 | 637 |
| 2013 | 964 |
| 2014 | 678 |
| 2015 | 513 |
| 2016 | 495 |
| 2017 | 455 |
| 2018 | 354 |
| 2019 | 350 |
| 2020 | 276 |
| 2021 | 310 |
| 2022 | 206 |
| 2023 | 172 |
| 2024 | 134 |