| Year | Count |
|---|---|
| 1956 | 6 |
| 1958 | 6 |
| 1989 | 8 |
| 1990 | 8 |
| 1993 | 8 |
| 1995 | 7 |
| 1996 | 9 |
| 1997 | 6 |
| 1998 | 13 |
| 1999 | 11 |
| 2000 | 14 |
| 2001 | 17 |
| 2002 | 12 |
| 2003 | 24 |
| 2004 | 34 |
| 2005 | 35 |
| 2006 | 34 |
| 2007 | 40 |
| 2008 | 56 |
| 2009 | 58 |
| 2010 | 81 |
| 2011 | 158 |
| 2012 | 203 |
| 2013 | 287 |
| 2014 | 326 |
| 2015 | 265 |
| 2016 | 506 |
| 2017 | 472 |
| 2018 | 412 |
| 2019 | 466 |
| 2020 | 208 |
| 2021 | 213 |
| 2022 | 182 |
| 2023 | 156 |
| 2024 | 163 |