| Year | Count |
|---|---|
| 1986 | 10 |
| 1990 | 12 |
| 1991 | 12 |
| 1993 | 16 |
| 1996 | 10 |
| 1999 | 10 |
| 2000 | 10 |
| 2002 | 6 |
| 2003 | 15 |
| 2004 | 18 |
| 2005 | 22 |
| 2006 | 21 |
| 2007 | 55 |
| 2008 | 48 |
| 2009 | 75 |
| 2010 | 90 |
| 2011 | 237 |
| 2012 | 130 |
| 2013 | 186 |
| 2014 | 204 |
| 2015 | 191 |
| 2016 | 252 |
| 2017 | 324 |
| 2018 | 290 |
| 2019 | 160 |
| 2020 | 128 |
| 2021 | 105 |
| 2022 | 117 |
| 2023 | 28 |
| 2024 | 26 |