| Year | Count |
|---|---|
| 1986 | 5 |
| 1987 | 6 |
| 1992 | 6 |
| 1995 | 11 |
| 1996 | 9 |
| 2000 | 29 |
| 2001 | 44 |
| 2002 | 38 |
| 2003 | 52 |
| 2004 | 88 |
| 2005 | 134 |
| 2006 | 102 |
| 2007 | 102 |
| 2008 | 151 |
| 2009 | 158 |
| 2010 | 184 |
| 2011 | 151 |
| 2012 | 132 |
| 2013 | 115 |
| 2014 | 88 |
| 2015 | 71 |
| 2016 | 71 |
| 2017 | 80 |
| 2018 | 60 |
| 2019 | 20 |
| 2020 | 42 |
| 2021 | 10 |
| 2022 | 43 |
| 2023 | 36 |
| 2024 | 37 |