| Year | Count |
|---|---|
| 1997 | 6 |
| 1998 | 5 |
| 1999 | 11 |
| 2000 | 23 |
| 2001 | 62 |
| 2002 | 71 |
| 2003 | 126 |
| 2004 | 111 |
| 2005 | 187 |
| 2006 | 256 |
| 2007 | 294 |
| 2008 | 5 |
| 2008 | 475 |
| 2009 | 492 |
| 2010 | 72 |
| 2010 | 705 |
| 2011 | 21 |
| 2011 | 809 |
| 2012 | 70 |
| 2012 | 1,129 |
| 2013 | 121 |
| 2013 | 1,451 |
| 2014 | 258 |
| 2014 | 2,642 |
| 2015 | 511 |
| 2015 | 3,372 |
| 2016 | 415 |
| 2016 | 3,152 |
| 2017 | 365 |
| 2017 | 3,339 |
| 2018 | 318 |
| 2018 | 3,193 |
| 2019 | 351 |
| 2019 | 3,381 |
| 2020 | 309 |
| 2020 | 2,821 |
| 2021 | 333 |
| 2021 | 2,500 |
| 2022 | 352 |
| 2022 | 2,202 |
| 2023 | 345 |
| 2023 | 1,965 |
| 2024 | 228 |
| 2024 | 1,717 |