| Year | Count |
|---|---|
| 1992 | 5 |
| 1993 | 11 |
| 1994 | 6 |
| 1995 | 9 |
| 1996 | 20 |
| 1997 | 45 |
| 1998 | 66 |
| 1999 | 49 |
| 2000 | 86 |
| 2001 | 30 |
| 2002 | 54 |
| 2003 | 71 |
| 2004 | 116 |
| 2005 | 209 |
| 2006 | 358 |
| 2007 | 373 |
| 2008 | 424 |
| 2009 | 417 |
| 2010 | 361 |
| 2011 | 366 |
| 2012 | 322 |
| 2013 | 338 |
| 2014 | 293 |
| 2015 | 348 |
| 2016 | 470 |
| 2017 | 436 |
| 2018 | 382 |
| 2019 | 428 |
| 2020 | 433 |
| 2021 | 464 |
| 2022 | 390 |
| 2023 | 430 |
| 2024 | 468 |