| Year | Count |
|---|---|
| 1990 | 5 |
| 1991 | 5 |
| 1992 | 8 |
| 1995 | 13 |
| 1996 | 14 |
| 1997 | 5 |
| 1998 | 12 |
| 2001 | 15 |
| 2002 | 7 |
| 2003 | 14 |
| 2004 | 18 |
| 2005 | 15 |
| 2006 | 28 |
| 2007 | 17 |
| 2008 | 31 |
| 2009 | 33 |
| 2010 | 23 |
| 2011 | 72 |
| 2012 | 23 |
| 2013 | 50 |
| 2014 | 71 |
| 2015 | 111 |
| 2016 | 109 |
| 2017 | 53 |
| 2018 | 56 |
| 2019 | 90 |
| 2020 | 155 |
| 2021 | 156 |
| 2022 | 155 |
| 2023 | 119 |
| 2024 | 128 |