| Year | Count |
|---|---|
| 1984 | 6 |
| 1987 | 10 |
| 1988 | 10 |
| 1989 | 10 |
| 1990 | 42 |
| 1991 | 156 |
| 1992 | 86 |
| 1993 | 86 |
| 1994 | 118 |
| 1995 | 145 |
| 1996 | 177 |
| 1997 | 189 |
| 1998 | 289 |
| 1999 | 284 |
| 2000 | 312 |
| 2001 | 411 |
| 2002 | 265 |
| 2003 | 504 |
| 2004 | 704 |
| 2005 | 694 |
| 2006 | 561 |
| 2007 | 508 |
| 2008 | 461 |
| 2009 | 511 |
| 2010 | 1,602 |
| 2011 | 2,270 |
| 2012 | 1,859 |
| 2013 | 1,653 |
| 2014 | 1,456 |
| 2015 | 1,448 |
| 2016 | 1,532 |
| 2017 | 1,202 |
| 2018 | 990 |
| 2019 | 969 |
| 2020 | 776 |
| 2021 | 744 |
| 2022 | 532 |
| 2023 | 489 |
| 2024 | 397 |