| Year | Count |
|---|---|
| 1953 | 7 |
| 1962 | 5 |
| 1963 | 5 |
| 1973 | 5 |
| 1979 | 10 |
| 1980 | 5 |
| 1991 | 5 |
| 1994 | 9 |
| 1995 | 6 |
| 1996 | 6 |
| 1997 | 10 |
| 1998 | 9 |
| 1999 | 25 |
| 2000 | 56 |
| 2001 | 87 |
| 2002 | 80 |
| 2003 | 138 |
| 2004 | 159 |
| 2005 | 185 |
| 2006 | 137 |
| 2007 | 90 |
| 2008 | 65 |
| 2009 | 72 |
| 2010 | 35 |
| 2011 | 52 |
| 2012 | 53 |
| 2013 | 62 |
| 2014 | 32 |
| 2015 | 48 |
| 2016 | 60 |
| 2017 | 70 |
| 2018 | 33 |
| 2019 | 33 |
| 2020 | 29 |
| 2021 | 39 |
| 2022 | 54 |
| 2023 | 32 |
| 2024 | 36 |