| Year | Count |
|---|---|
| 1990 | 10 |
| 1991 | 20 |
| 1992 | 21 |
| 1993 | 7 |
| 1994 | 33 |
| 1995 | 52 |
| 1996 | 97 |
| 1997 | 110 |
| 1998 | 194 |
| 1999 | 200 |
| 2000 | 375 |
| 2001 | 456 |
| 2002 | 598 |
| 2003 | 633 |
| 2004 | 802 |
| 2005 | 936 |
| 2006 | 1,185 |
| 2007 | 951 |
| 2008 | 906 |
| 2009 | 838 |
| 2010 | 778 |
| 2011 | 572 |
| 2012 | 559 |
| 2013 | 574 |
| 2014 | 464 |
| 2015 | 504 |
| 2016 | 466 |
| 2017 | 366 |
| 2018 | 265 |
| 2019 | 288 |
| 2020 | 186 |
| 2021 | 246 |
| 2022 | 289 |
| 2023 | 233 |
| 2024 | 360 |