| Year | Count |
|---|---|
| 1917 | 7 |
| 1922 | 6 |
| 1925 | 9 |
| 1926 | 7 |
| 1929 | 5 |
| 1931 | 6 |
| 1932 | 6 |
| 1936 | 5 |
| 1938 | 6 |
| 1947 | 6 |
| 1948 | 7 |
| 1952 | 5 |
| 1956 | 5 |
| 1967 | 5 |
| 1969 | 8 |
| 1975 | 6 |
| 1982 | 6 |
| 1986 | 5 |
| 1987 | 7 |
| 1988 | 5 |
| 1990 | 12 |
| 1991 | 5 |
| 1992 | 5 |
| 1993 | 6 |
| 1994 | 7 |
| 1995 | 8 |
| 1996 | 6 |
| 1997 | 6 |
| 1999 | 7 |
| 2000 | 12 |
| 2002 | 14 |
| 2003 | 11 |
| 2004 | 27 |
| 2005 | 18 |
| 2006 | 26 |
| 2007 | 28 |
| 2008 | 33 |
| 2009 | 25 |
| 2010 | 22 |
| 2011 | 29 |
| 2012 | 24 |
| 2013 | 15 |
| 2014 | 29 |
| 2015 | 35 |
| 2016 | 60 |
| 2017 | 62 |
| 2018 | 40 |
| 2019 | 34 |
| 2020 | 24 |
| 2021 | 24 |
| 2022 | 11 |
| 2023 | 10 |
| 2024 | 21 |