| Year | Count |
|---|---|
| 1980 | 5 |
| 1996 | 5 |
| 1997 | 6 |
| 1998 | 21 |
| 1999 | 48 |
| 2000 | 97 |
| 2001 | 137 |
| 2002 | 134 |
| 2003 | 173 |
| 2004 | 270 |
| 2005 | 309 |
| 2006 | 377 |
| 2007 | 403 |
| 2008 | 537 |
| 2009 | 412 |
| 2010 | 460 |
| 2011 | 514 |
| 2012 | 611 |
| 2013 | 742 |
| 2014 | 933 |
| 2015 | 1,228 |
| 2016 | 1,328 |
| 2017 | 1,489 |
| 2018 | 1,487 |
| 2019 | 1,596 |
| 2020 | 1,321 |
| 2021 | 1,549 |
| 2022 | 1,383 |
| 2023 | 1,176 |
| 2024 | 1,459 |