| Year | Count |
|---|---|
| 1989 | 11 |
| 1990 | 10 |
| 1991 | 13 |
| 1992 | 16 |
| 1993 | 27 |
| 1994 | 36 |
| 1995 | 66 |
| 1996 | 95 |
| 1997 | 84 |
| 1998 | 94 |
| 1999 | 44 |
| 2000 | 91 |
| 2001 | 68 |
| 2002 | 75 |
| 2003 | 44 |
| 2004 | 97 |
| 2005 | 114 |
| 2006 | 124 |
| 2007 | 187 |
| 2008 | 268 |
| 2009 | 273 |
| 2010 | 261 |
| 2011 | 291 |
| 2012 | 267 |
| 2013 | 303 |
| 2014 | 617 |
| 2015 | 1,282 |
| 2016 | 1,854 |
| 2017 | 1,940 |
| 2018 | 1,585 |
| 2019 | 1,366 |
| 2020 | 982 |
| 2021 | 1,098 |
| 2022 | 1,029 |
| 2023 | 987 |
| 2024 | 1,001 |