| Year | Count |
|---|---|
| 1989 | 7 |
| 1991 | 5 |
| 1994 | 11 |
| 1999 | 10 |
| 2000 | 17 |
| 2001 | 19 |
| 2002 | 33 |
| 2003 | 54 |
| 2004 | 37 |
| 2005 | 96 |
| 2006 | 41 |
| 2007 | 60 |
| 2008 | 96 |
| 2009 | 106 |
| 2010 | 93 |
| 2011 | 67 |
| 2012 | 130 |
| 2013 | 116 |
| 2014 | 138 |
| 2015 | 262 |
| 2016 | 475 |
| 2017 | 345 |
| 2018 | 346 |
| 2019 | 292 |
| 2020 | 264 |
| 2021 | 295 |
| 2022 | 248 |
| 2023 | 227 |
| 2024 | 148 |