| Year | Count |
|---|---|
| 1989 | 7 |
| 1990 | 5 |
| 1992 | 16 |
| 1993 | 20 |
| 1994 | 5 |
| 1995 | 30 |
| 1996 | 69 |
| 1997 | 76 |
| 1998 | 154 |
| 1999 | 218 |
| 2000 | 237 |
| 2001 | 303 |
| 2002 | 511 |
| 2003 | 1,212 |
| 2004 | 12 |
| 2004 | 1,526 |
| 2005 | 1,995 |
| 2006 | 2,520 |
| 2007 | 2,417 |
| 2008 | 2,503 |
| 2009 | 2,381 |
| 2010 | 2,062 |
| 2011 | 1,913 |
| 2012 | 1,831 |
| 2013 | 1,558 |
| 2014 | 1,429 |
| 2015 | 1,325 |
| 2016 | 1,139 |
| 2017 | 972 |
| 2018 | 812 |
| 2019 | 762 |
| 2020 | 519 |
| 2021 | 582 |
| 2022 | 363 |
| 2023 | 300 |
| 2024 | 298 |