| Year | Count |
|---|---|
| 1975 | 6 |
| 1980 | 7 |
| 1985 | 6 |
| 1993 | 10 |
| 1994 | 10 |
| 1995 | 10 |
| 1996 | 13 |
| 1997 | 31 |
| 1998 | 32 |
| 1999 | 36 |
| 2000 | 12 |
| 2001 | 35 |
| 2002 | 69 |
| 2003 | 95 |
| 2004 | 142 |
| 2005 | 127 |
| 2006 | 164 |
| 2007 | 5 |
| 2007 | 245 |
| 2008 | 305 |
| 2009 | 260 |
| 2010 | 263 |
| 2011 | 303 |
| 2012 | 386 |
| 2013 | 317 |
| 2014 | 403 |
| 2015 | 524 |
| 2016 | 565 |
| 2017 | 5 |
| 2017 | 484 |
| 2018 | 570 |
| 2019 | 576 |
| 2020 | 520 |
| 2021 | 579 |
| 2022 | 6 |
| 2022 | 542 |
| 2023 | 5 |
| 2023 | 505 |
| 2024 | 535 |