| Year | Count |
|---|---|
| 1982 | 6 |
| 1983 | 5 |
| 1985 | 6 |
| 1987 | 11 |
| 1993 | 6 |
| 1997 | 20 |
| 1998 | 18 |
| 1999 | 34 |
| 2000 | 5 |
| 2001 | 29 |
| 2002 | 33 |
| 2003 | 45 |
| 2004 | 36 |
| 2005 | 50 |
| 2006 | 93 |
| 2007 | 142 |
| 2008 | 251 |
| 2009 | 196 |
| 2010 | 127 |
| 2011 | 226 |
| 2012 | 216 |
| 2013 | 176 |
| 2014 | 170 |
| 2015 | 209 |
| 2016 | 177 |
| 2017 | 211 |
| 2018 | 128 |
| 2019 | 108 |
| 2020 | 95 |
| 2021 | 114 |
| 2022 | 78 |
| 2023 | 44 |
| 2024 | 47 |