| Year | Count |
|---|---|
| 1913 | 5 |
| 1914 | 5 |
| 1915 | 6 |
| 1920 | 5 |
| 1925 | 6 |
| 1928 | 5 |
| 1929 | 6 |
| 1932 | 5 |
| 1957 | 5 |
| 1958 | 10 |
| 1961 | 7 |
| 1962 | 5 |
| 1968 | 7 |
| 1981 | 5 |
| 1983 | 5 |
| 1985 | 7 |
| 1986 | 18 |
| 1987 | 19 |
| 1988 | 7 |
| 1989 | 6 |
| 1990 | 5 |
| 1992 | 11 |
| 1993 | 16 |
| 1994 | 11 |
| 1995 | 12 |
| 1996 | 9 |
| 1997 | 9 |
| 1998 | 12 |
| 1999 | 10 |
| 2000 | 16 |
| 2001 | 17 |
| 2002 | 19 |
| 2003 | 15 |
| 2004 | 17 |
| 2005 | 20 |
| 2006 | 23 |
| 2007 | 32 |
| 2008 | 13 |
| 2009 | 17 |
| 2010 | 15 |
| 2011 | 16 |
| 2012 | 6 |
| 2013 | 11 |
| 2014 | 11 |
| 2015 | 12 |
| 2016 | 20 |
| 2017 | 30 |
| 2018 | 22 |
| 2020 | 6 |
| 2022 | 9 |
| 2023 | 5 |
| 2024 | 8 |