| Year | Count |
|---|---|
| 1997 | 13 |
| 1998 | 26 |
| 1999 | 19 |
| 2000 | 226 |
| 2001 | 536 |
| 2002 | 366 |
| 2003 | 250 |
| 2004 | 237 |
| 2005 | 156 |
| 2006 | 172 |
| 2007 | 221 |
| 2008 | 209 |
| 2009 | 144 |
| 2010 | 158 |
| 2011 | 92 |
| 2012 | 112 |
| 2013 | 146 |
| 2014 | 123 |
| 2015 | 148 |
| 2016 | 93 |
| 2017 | 194 |
| 2018 | 55 |
| 2019 | 61 |
| 2020 | 57 |
| 2021 | 70 |
| 2022 | 94 |
| 2023 | 41 |
| 2024 | 44 |