| Year | Count |
|---|---|
| 1991 | 5 |
| 1995 | 7 |
| 1996 | 8 |
| 1997 | 5 |
| 1998 | 18 |
| 1999 | 21 |
| 2000 | 29 |
| 2001 | 39 |
| 2002 | 39 |
| 2003 | 32 |
| 2004 | 46 |
| 2005 | 42 |
| 2006 | 40 |
| 2007 | 54 |
| 2008 | 51 |
| 2009 | 50 |
| 2010 | 57 |
| 2011 | 59 |
| 2012 | 67 |
| 2013 | 53 |
| 2014 | 61 |
| 2015 | 53 |
| 2016 | 135 |
| 2017 | 120 |
| 2018 | 40 |
| 2019 | 70 |
| 2020 | 44 |
| 2021 | 90 |
| 2022 | 48 |
| 2023 | 58 |
| 2024 | 40 |