| Year | Count |
|---|---|
| 1981 | 5 |
| 1985 | 16 |
| 1988 | 10 |
| 1990 | 120 |
| 1991 | 173 |
| 1992 | 301 |
| 1993 | 417 |
| 1994 | 511 |
| 1995 | 905 |
| 1996 | 1,208 |
| 1997 | 1,265 |
| 1998 | 1,708 |
| 1999 | 1,553 |
| 2000 | 1,701 |
| 2001 | 1,748 |
| 2002 | 1,969 |
| 2003 | 2,173 |
| 2004 | 2,659 |
| 2004 | 14 |
| 2005 | 2,395 |
| 2006 | 2,350 |
| 2007 | 2,183 |
| 2008 | 1,933 |
| 2009 | 1,587 |
| 2010 | 1,653 |
| 2011 | 1,577 |
| 2012 | 1,523 |
| 2013 | 1,473 |
| 2014 | 1,376 |
| 2015 | 1,517 |
| 2016 | 1,455 |
| 2017 | 1,535 |
| 2018 | 1,599 |
| 2019 | 1,339 |
| 2020 | 1,150 |
| 2021 | 1,416 |
| 2022 | 1,579 |
| 2023 | 1,560 |
| 2024 | 1,648 |