| Year | Count |
|---|---|
| 1986 | 12 |
| 1991 | 20 |
| 1992 | 29 |
| 1993 | 141 |
| 1994 | 158 |
| 1995 | 202 |
| 1996 | 272 |
| 1997 | 438 |
| 1998 | 534 |
| 1999 | 498 |
| 2000 | 539 |
| 2001 | 507 |
| 2002 | 647 |
| 2003 | 852 |
| 2004 | 1,221 |
| 2004 | 12 |
| 2005 | 1,652 |
| 2006 | 1,834 |
| 2007 | 2,257 |
| 2008 | 2,270 |
| 2009 | 2,150 |
| 2010 | 2,432 |
| 2011 | 2,952 |
| 2012 | 2,752 |
| 2013 | 2,388 |
| 2014 | 2,282 |
| 2015 | 2,242 |
| 2016 | 2,021 |
| 2017 | 1,661 |
| 2018 | 1,531 |
| 2019 | 1,461 |
| 2020 | 1,267 |
| 2021 | 1,215 |
| 2022 | 1,076 |
| 2023 | 1,001 |
| 2024 | 809 |