| Year | Count |
|---|---|
| 1990 | 5 |
| 1991 | 13 |
| 1992 | 9 |
| 1993 | 9 |
| 1994 | 11 |
| 1995 | 31 |
| 1996 | 74 |
| 1997 | 90 |
| 1998 | 139 |
| 1999 | 129 |
| 2000 | 159 |
| 2001 | 172 |
| 2002 | 137 |
| 2003 | 167 |
| 2004 | 208 |
| 2005 | 313 |
| 2006 | 271 |
| 2007 | 174 |
| 2008 | 262 |
| 2009 | 218 |
| 2010 | 267 |
| 2011 | 309 |
| 2012 | 604 |
| 2013 | 838 |
| 2014 | 1,013 |
| 2015 | 915 |
| 2016 | 854 |
| 2017 | 848 |
| 2018 | 718 |
| 2019 | 687 |
| 2020 | 536 |
| 2021 | 605 |
| 2022 | 625 |
| 2023 | 502 |
| 2024 | 440 |