| Year | Count |
|---|---|
| 1934 | 6 |
| 1958 | 10 |
| 1985 | 10 |
| 1990 | 10 |
| 1991 | 20 |
| 1992 | 20 |
| 1993 | 10 |
| 1994 | 18 |
| 1995 | 18 |
| 1996 | 57 |
| 1997 | 34 |
| 1998 | 48 |
| 1999 | 15 |
| 2000 | 17 |
| 2001 | 47 |
| 2002 | 58 |
| 2003 | 44 |
| 2004 | 127 |
| 2005 | 288 |
| 2006 | 215 |
| 2007 | 130 |
| 2008 | 184 |
| 2009 | 105 |
| 2010 | 134 |
| 2011 | 109 |
| 2012 | 115 |
| 2013 | 173 |
| 2014 | 160 |
| 2015 | 192 |
| 2016 | 108 |
| 2017 | 129 |
| 2018 | 66 |
| 2019 | 47 |
| 2020 | 71 |
| 2021 | 64 |
| 2022 | 53 |
| 2023 | 53 |
| 2024 | 112 |