| Year | Count |
|---|---|
| 1989 | 36 |
| 1990 | 5 |
| 1991 | 5 |
| 1996 | 7 |
| 1997 | 11 |
| 1998 | 33 |
| 2000 | 16 |
| 2002 | 16 |
| 2003 | 29 |
| 2004 | 60 |
| 2005 | 41 |
| 2006 | 40 |
| 2007 | 55 |
| 2008 | 92 |
| 2009 | 66 |
| 2010 | 97 |
| 2011 | 154 |
| 2012 | 93 |
| 2013 | 123 |
| 2014 | 167 |
| 2015 | 307 |
| 2016 | 385 |
| 2017 | 416 |
| 2018 | 357 |
| 2019 | 330 |
| 2020 | 467 |
| 2021 | 613 |
| 2022 | 701 |
| 2023 | 841 |
| 2024 | 990 |