| Year | Count |
|---|---|
| 1924 | 5 |
| 1942 | 6 |
| 1948 | 6 |
| 1951 | 5 |
| 1957 | 5 |
| 1959 | 6 |
| 1960 | 5 |
| 1963 | 5 |
| 1964 | 5 |
| 1972 | 6 |
| 1975 | 6 |
| 1979 | 9 |
| 1982 | 6 |
| 1983 | 6 |
| 1991 | 7 |
| 1994 | 5 |
| 1997 | 5 |
| 1999 | 5 |
| 2001 | 10 |
| 2003 | 11 |
| 2004 | 8 |
| 2005 | 10 |
| 2006 | 14 |
| 2007 | 29 |
| 2008 | 17 |
| 2009 | 27 |
| 2010 | 34 |
| 2011 | 25 |
| 2012 | 72 |
| 2013 | 137 |
| 2014 | 145 |
| 2015 | 145 |
| 2016 | 326 |
| 2017 | 324 |
| 2018 | 282 |
| 2019 | 300 |
| 2020 | 124 |
| 2021 | 109 |
| 2022 | 86 |
| 2023 | 66 |
| 2024 | 57 |