| Year | Count |
|---|---|
| 1970 | 6 |
| 1973 | 5 |
| 1983 | 5 |
| 1989 | 5 |
| 1990 | 6 |
| 1991 | 5 |
| 1992 | 5 |
| 1994 | 6 |
| 1996 | 11 |
| 1997 | 5 |
| 1998 | 15 |
| 1999 | 6 |
| 2000 | 6 |
| 2001 | 21 |
| 2002 | 6 |
| 2003 | 15 |
| 2004 | 22 |
| 2005 | 65 |
| 2006 | 84 |
| 2007 | 63 |
| 2008 | 52 |
| 2009 | 46 |
| 2010 | 76 |
| 2011 | 46 |
| 2012 | 67 |
| 2013 | 72 |
| 2014 | 44 |
| 2015 | 41 |
| 2016 | 48 |
| 2017 | 43 |
| 2018 | 57 |
| 2019 | 25 |
| 2020 | 12 |
| 2021 | 58 |
| 2022 | 38 |
| 2023 | 27 |
| 2024 | 37 |