| Year | Count |
|---|---|
| 1984 | 5 |
| 1985 | 6 |
| 1988 | 10 |
| 1991 | 14 |
| 1992 | 5 |
| 1995 | 5 |
| 1997 | 12 |
| 1998 | 17 |
| 1999 | 5 |
| 2000 | 6 |
| 2001 | 7 |
| 2002 | 10 |
| 2003 | 37 |
| 2004 | 43 |
| 2005 | 55 |
| 2006 | 65 |
| 2007 | 63 |
| 2008 | 54 |
| 2009 | 20 |
| 2010 | 72 |
| 2011 | 35 |
| 2012 | 57 |
| 2013 | 53 |
| 2014 | 48 |
| 2015 | 49 |
| 2016 | 55 |
| 2017 | 35 |
| 2018 | 22 |
| 2019 | 16 |
| 2020 | 21 |
| 2021 | 44 |
| 2022 | 51 |
| 2023 | 5 |
| 2024 | 28 |