| Year | Count |
|---|---|
| 1988 | 7 |
| 1990 | 15 |
| 1991 | 61 |
| 1992 | 123 |
| 1993 | 87 |
| 1994 | 220 |
| 1995 | 353 |
| 1996 | 476 |
| 1997 | 563 |
| 1998 | 685 |
| 1999 | 528 |
| 2000 | 654 |
| 2001 | 571 |
| 2002 | 551 |
| 2003 | 608 |
| 2004 | 715 |
| 2005 | 908 |
| 2006 | 924 |
| 2007 | 1,056 |
| 2008 | 1,207 |
| 2009 | 1,243 |
| 2010 | 1,227 |
| 2011 | 1,180 |
| 2012 | 1,114 |
| 2013 | 953 |
| 2014 | 1,007 |
| 2015 | 1,185 |
| 2016 | 1,133 |
| 2017 | 978 |
| 2018 | 754 |
| 2019 | 790 |
| 2020 | 647 |
| 2021 | 593 |
| 2022 | 671 |
| 2023 | 667 |
| 2024 | 629 |