| Year | Count |
|---|---|
| 1975 | 10 |
| 1990 | 5 |
| 1992 | 10 |
| 1995 | 20 |
| 1996 | 16 |
| 1997 | 5 |
| 1998 | 71 |
| 1999 | 93 |
| 2000 | 89 |
| 2001 | 198 |
| 2002 | 191 |
| 2003 | 200 |
| 2004 | 209 |
| 2005 | 144 |
| 2006 | 115 |
| 2007 | 126 |
| 2008 | 111 |
| 2009 | 75 |
| 2010 | 78 |
| 2011 | 59 |
| 2012 | 77 |
| 2013 | 34 |
| 2014 | 43 |
| 2015 | 15 |
| 2016 | 31 |
| 2017 | 11 |
| 2018 | 15 |
| 2019 | 5 |
| 2020 | 12 |
| 2021 | 15 |
| 2022 | 22 |
| 2023 | 14 |
| 2024 | 12 |