| Year | Count |
|---|---|
| 1990 | 6 |
| 1992 | 5 |
| 1994 | 10 |
| 1995 | 6 |
| 1996 | 13 |
| 1997 | 13 |
| 1998 | 19 |
| 1999 | 6 |
| 2000 | 15 |
| 2001 | 26 |
| 2002 | 19 |
| 2003 | 40 |
| 2004 | 47 |
| 2005 | 43 |
| 2006 | 66 |
| 2007 | 70 |
| 2008 | 72 |
| 2009 | 87 |
| 2010 | 54 |
| 2011 | 91 |
| 2012 | 112 |
| 2013 | 115 |
| 2014 | 159 |
| 2015 | 217 |
| 2016 | 213 |
| 2017 | 240 |
| 2018 | 197 |
| 2019 | 212 |
| 2020 | 210 |
| 2021 | 286 |
| 2022 | 318 |
| 2023 | 430 |
| 2024 | 380 |