| Year | Count |
|---|---|
| 1917 | 5 |
| 1924 | 7 |
| 1928 | 9 |
| 1931 | 6 |
| 1932 | 5 |
| 1937 | 7 |
| 1948 | 7 |
| 1955 | 5 |
| 1957 | 6 |
| 1961 | 5 |
| 1964 | 6 |
| 1985 | 8 |
| 1986 | 5 |
| 1987 | 8 |
| 1988 | 8 |
| 1989 | 14 |
| 1990 | 5 |
| 1991 | 9 |
| 1992 | 11 |
| 1993 | 16 |
| 1994 | 13 |
| 1995 | 12 |
| 1996 | 14 |
| 1997 | 23 |
| 1998 | 17 |
| 1999 | 12 |
| 2000 | 21 |
| 2001 | 21 |
| 2002 | 29 |
| 2003 | 18 |
| 2004 | 19 |
| 2005 | 22 |
| 2006 | 22 |
| 2007 | 19 |
| 2008 | 27 |
| 2009 | 27 |
| 2010 | 30 |
| 2011 | 13 |
| 2012 | 20 |
| 2013 | 24 |
| 2014 | 27 |
| 2015 | 33 |
| 2016 | 74 |
| 2017 | 46 |
| 2018 | 44 |
| 2019 | 48 |
| 2020 | 27 |
| 2021 | 23 |
| 2022 | 19 |
| 2023 | 27 |
| 2024 | 29 |