| Year | Count |
|---|---|
| 1988 | 10 |
| 1989 | 24 |
| 1990 | 118 |
| 1991 | 364 |
| 1992 | 303 |
| 1993 | 335 |
| 1994 | 282 |
| 1995 | 297 |
| 1996 | 347 |
| 1997 | 301 |
| 1998 | 217 |
| 1999 | 137 |
| 2000 | 105 |
| 2001 | 132 |
| 2002 | 80 |
| 2003 | 127 |
| 2004 | 159 |
| 2005 | 134 |
| 2006 | 138 |
| 2007 | 133 |
| 2008 | 178 |
| 2009 | 302 |
| 2010 | 290 |
| 2011 | 324 |
| 2012 | 338 |
| 2013 | 331 |
| 2014 | 409 |
| 2015 | 504 |
| 2016 | 626 |
| 2017 | 724 |
| 2018 | 806 |
| 2019 | 863 |
| 2020 | 936 |
| 2021 | 950 |
| 2022 | 954 |
| 2023 | 921 |
| 2024 | 796 |