| Year | Count |
|---|---|
| 1956 | 5 |
| 1988 | 5 |
| 1989 | 6 |
| 1991 | 5 |
| 1993 | 6 |
| 1996 | 6 |
| 1997 | 9 |
| 1998 | 8 |
| 1999 | 6 |
| 2000 | 13 |
| 2001 | 12 |
| 2002 | 11 |
| 2003 | 20 |
| 2004 | 8 |
| 2005 | 13 |
| 2006 | 14 |
| 2007 | 24 |
| 2008 | 32 |
| 2009 | 135 |
| 2010 | 68 |
| 2011 | 54 |
| 2012 | 53 |
| 2013 | 64 |
| 2014 | 58 |
| 2015 | 61 |
| 2016 | 270 |
| 2017 | 303 |
| 2018 | 122 |
| 2019 | 156 |
| 2020 | 112 |
| 2021 | 106 |
| 2022 | 108 |
| 2023 | 140 |
| 2024 | 88 |