| Year | Count |
|---|---|
| 1980 | 5 |
| 1991 | 14 |
| 1992 | 11 |
| 1995 | 11 |
| 1997 | 7 |
| 1998 | 26 |
| 1999 | 5 |
| 2000 | 25 |
| 2001 | 6 |
| 2002 | 7 |
| 2003 | 6 |
| 2004 | 81 |
| 2005 | 196 |
| 2006 | 106 |
| 2007 | 98 |
| 2008 | 125 |
| 2009 | 33 |
| 2010 | 50 |
| 2011 | 13 |
| 2012 | 6 |
| 2013 | 17 |
| 2014 | 5 |
| 2015 | 29 |
| 2016 | 15 |
| 2017 | 22 |
| 2018 | 5 |
| 2019 | 7 |
| 2020 | 10 |
| 2022 | 6 |
| 2023 | 10 |
| 2024 | 16 |