| Year | Count |
|---|---|
| 1997 | 8 |
| 1998 | 18 |
| 1999 | 20 |
| 2000 | 5 |
| 2001 | 28 |
| 2002 | 40 |
| 2003 | 68 |
| 2004 | 153 |
| 2005 | 154 |
| 2006 | 202 |
| 2007 | 272 |
| 2008 | 394 |
| 2009 | 272 |
| 2010 | 266 |
| 2011 | 394 |
| 2012 | 346 |
| 2013 | 327 |
| 2014 | 242 |
| 2015 | 440 |
| 2016 | 325 |
| 2017 | 382 |
| 2018 | 253 |
| 2019 | 195 |
| 2020 | 234 |
| 2021 | 152 |
| 2022 | 175 |
| 2023 | 110 |
| 2024 | 88 |