| Year | Count |
|---|---|
| 1991 | 6 |
| 1992 | 6 |
| 1996 | 6 |
| 1997 | 11 |
| 1998 | 10 |
| 1999 | 10 |
| 2000 | 10 |
| 2001 | 5 |
| 2002 | 7 |
| 2004 | 7 |
| 2005 | 17 |
| 2006 | 6 |
| 2007 | 51 |
| 2008 | 50 |
| 2009 | 49 |
| 2010 | 40 |
| 2011 | 56 |
| 2012 | 94 |
| 2013 | 130 |
| 2014 | 84 |
| 2015 | 150 |
| 2016 | 142 |
| 2017 | 117 |
| 2018 | 130 |
| 2019 | 69 |
| 2020 | 113 |
| 2021 | 113 |
| 2022 | 101 |
| 2023 | 65 |
| 2024 | 39 |