| Year | Count |
|---|---|
| 1989 | 17 |
| 1990 | 66 |
| 1992 | 15 |
| 1993 | 27 |
| 1994 | 17 |
| 1995 | 33 |
| 1996 | 45 |
| 1997 | 38 |
| 1998 | 63 |
| 1999 | 59 |
| 2000 | 53 |
| 2001 | 17 |
| 2002 | 54 |
| 2003 | 93 |
| 2004 | 182 |
| 2005 | 99 |
| 2006 | 141 |
| 2007 | 94 |
| 2008 | 154 |
| 2009 | 89 |
| 2010 | 99 |
| 2011 | 127 |
| 2012 | 126 |
| 2013 | 153 |
| 2014 | 141 |
| 2015 | 208 |
| 2016 | 226 |
| 2017 | 295 |
| 2018 | 247 |
| 2019 | 386 |
| 2020 | 519 |
| 2021 | 823 |
| 2022 | 1,499 |
| 2023 | 1,836 |
| 2024 | 1,657 |