| Year | Count |
|---|---|
| 1997 | 7 |
| 1999 | 21 |
| 2000 | 23 |
| 2000 | 11 |
| 2001 | 20 |
| 2001 | 8 |
| 2002 | 10 |
| 2003 | 37 |
| 2003 | 5 |
| 2004 | 24 |
| 2004 | 21 |
| 2005 | 33 |
| 2005 | 26 |
| 2006 | 24 |
| 2006 | 74 |
| 2007 | 6 |
| 2007 | 28 |
| 2008 | 18 |
| 2008 | 104 |
| 2009 | 14 |
| 2009 | 79 |
| 2010 | 21 |
| 2010 | 157 |
| 2011 | 35 |
| 2011 | 155 |
| 2012 | 12 |
| 2012 | 184 |
| 2013 | 10 |
| 2013 | 124 |
| 2014 | 193 |
| 2015 | 22 |
| 2015 | 207 |
| 2016 | 18 |
| 2016 | 166 |
| 2017 | 12 |
| 2017 | 229 |
| 2018 | 230 |
| 2019 | 5 |
| 2019 | 147 |
| 2020 | 117 |
| 2021 | 116 |
| 2022 | 69 |
| 2023 | 68 |
| 2024 | 36 |