| Year | Count |
|---|---|
| 1950 | 6 |
| 1952 | 7 |
| 1953 | 6 |
| 1960 | 10 |
| 1964 | 6 |
| 1965 | 5 |
| 1967 | 7 |
| 1969 | 5 |
| 1973 | 5 |
| 1974 | 6 |
| 1977 | 10 |
| 1982 | 6 |
| 1987 | 6 |
| 1989 | 7 |
| 1996 | 6 |
| 1997 | 12 |
| 1998 | 13 |
| 1999 | 8 |
| 2000 | 10 |
| 2001 | 12 |
| 2002 | 6 |
| 2003 | 18 |
| 2004 | 14 |
| 2005 | 14 |
| 2006 | 19 |
| 2007 | 17 |
| 2008 | 20 |
| 2009 | 23 |
| 2010 | 25 |
| 2011 | 25 |
| 2012 | 38 |
| 2013 | 36 |
| 2014 | 36 |
| 2015 | 38 |
| 2016 | 138 |
| 2017 | 171 |
| 2018 | 50 |
| 2019 | 96 |
| 2020 | 96 |
| 2021 | 90 |
| 2022 | 88 |
| 2023 | 112 |
| 2024 | 112 |