| Year | Count |
|---|---|
| 1990 | 5 |
| 1991 | 7 |
| 1996 | 6 |
| 1997 | 19 |
| 1998 | 10 |
| 1999 | 6 |
| 2000 | 31 |
| 2001 | 12 |
| 2002 | 10 |
| 2003 | 51 |
| 2004 | 40 |
| 2005 | 32 |
| 2006 | 52 |
| 2007 | 61 |
| 2008 | 37 |
| 2009 | 25 |
| 2010 | 23 |
| 2011 | 55 |
| 2012 | 51 |
| 2013 | 41 |
| 2014 | 48 |
| 2015 | 99 |
| 2016 | 82 |
| 2017 | 41 |
| 2018 | 49 |
| 2019 | 26 |
| 2020 | 50 |
| 2021 | 30 |
| 2022 | 32 |
| 2023 | 27 |
| 2024 | 14 |