| Year | Count |
|---|---|
| 1998 | 5 |
| 1999 | 6 |
| 2000 | 5 |
| 2001 | 10 |
| 2001 | 14 |
| 2002 | 5 |
| 2002 | 23 |
| 2003 | 12 |
| 2003 | 79 |
| 2004 | 20 |
| 2004 | 154 |
| 2005 | 43 |
| 2005 | 137 |
| 2006 | 28 |
| 2006 | 151 |
| 2007 | 66 |
| 2007 | 249 |
| 2008 | 93 |
| 2008 | 317 |
| 2009 | 5 |
| 2009 | 272 |
| 2010 | 51 |
| 2010 | 181 |
| 2011 | 5 |
| 2011 | 175 |
| 2012 | 144 |
| 2013 | 94 |
| 2014 | 57 |
| 2015 | 42 |
| 2016 | 32 |
| 2017 | 22 |
| 2018 | 5 |
| 2019 | 6 |
| 2022 | 10 |