| Year | Count |
|---|---|
| 1949 | 8 |
| 1957 | 12 |
| 1958 | 12 |
| 1960 | 10 |
| 1961 | 8 |
| 1966 | 5 |
| 1971 | 5 |
| 1983 | 5 |
| 1984 | 7 |
| 1986 | 5 |
| 1990 | 5 |
| 1991 | 5 |
| 1992 | 7 |
| 1993 | 5 |
| 1994 | 5 |
| 1996 | 6 |
| 1997 | 6 |
| 1998 | 8 |
| 1999 | 8 |
| 2000 | 10 |
| 2001 | 6 |
| 2002 | 8 |
| 2003 | 7 |
| 2004 | 22 |
| 2005 | 30 |
| 2006 | 56 |
| 2007 | 44 |
| 2008 | 25 |
| 2009 | 24 |
| 2010 | 19 |
| 2011 | 21 |
| 2012 | 18 |
| 2013 | 25 |
| 2014 | 19 |
| 2015 | 22 |
| 2016 | 78 |
| 2017 | 60 |
| 2018 | 25 |
| 2019 | 64 |
| 2020 | 36 |
| 2021 | 52 |
| 2022 | 56 |
| 2023 | 50 |
| 2024 | 42 |