| Year | Count |
|---|---|
| 1981 | 6 |
| 1992 | 10 |
| 1994 | 10 |
| 1995 | 20 |
| 1996 | 7 |
| 1997 | 30 |
| 1998 | 35 |
| 2000 | 17 |
| 2001 | 114 |
| 2002 | 267 |
| 2003 | 311 |
| 2004 | 631 |
| 2005 | 893 |
| 2006 | 586 |
| 2007 | 471 |
| 2008 | 677 |
| 2009 | 505 |
| 2010 | 539 |
| 2011 | 610 |
| 2012 | 592 |
| 2013 | 482 |
| 2014 | 461 |
| 2015 | 696 |
| 2016 | 709 |
| 2017 | 707 |
| 2018 | 572 |
| 2019 | 550 |
| 2020 | 487 |
| 2021 | 576 |
| 2022 | 596 |
| 2023 | 613 |
| 2024 | 486 |