| Year | Count |
|---|---|
| 1989 | 6 |
| 1990 | 58 |
| 1991 | 132 |
| 1992 | 74 |
| 1993 | 87 |
| 1994 | 103 |
| 1995 | 182 |
| 1996 | 153 |
| 1997 | 270 |
| 1998 | 449 |
| 1999 | 425 |
| 2000 | 503 |
| 2001 | 689 |
| 2002 | 812 |
| 2003 | 1,171 |
| 2004 | 1,342 |
| 2005 | 1,586 |
| 2006 | 1,841 |
| 2007 | 2,296 |
| 2008 | 2,382 |
| 2009 | 2,226 |
| 2010 | 2,140 |
| 2011 | 2,098 |
| 2012 | 2,118 |
| 2013 | 2,080 |
| 2014 | 1,892 |
| 2015 | 1,867 |
| 2016 | 1,832 |
| 2017 | 1,751 |
| 2018 | 1,625 |
| 2019 | 1,493 |
| 2020 | 1,334 |
| 2021 | 1,419 |
| 2022 | 1,262 |
| 2023 | 1,017 |
| 2024 | 920 |