| Year | Count |
|---|---|
| 1915 | 5 |
| 1916 | 7 |
| 1922 | 12 |
| 1924 | 6 |
| 1926 | 6 |
| 1929 | 5 |
| 1932 | 7 |
| 1933 | 7 |
| 1938 | 6 |
| 1941 | 5 |
| 1953 | 8 |
| 1959 | 5 |
| 1968 | 10 |
| 1969 | 5 |
| 1970 | 16 |
| 1975 | 6 |
| 1978 | 5 |
| 1983 | 6 |
| 1987 | 6 |
| 1989 | 5 |
| 1992 | 17 |
| 1993 | 5 |
| 1994 | 16 |
| 1995 | 8 |
| 1996 | 5 |
| 1997 | 5 |
| 1998 | 6 |
| 1999 | 18 |
| 2000 | 6 |
| 2001 | 11 |
| 2002 | 8 |
| 2003 | 5 |
| 2004 | 5 |
| 2005 | 16 |
| 2006 | 6 |
| 2007 | 12 |
| 2008 | 12 |
| 2009 | 11 |
| 2010 | 5 |
| 2012 | 30 |
| 2013 | 5 |
| 2014 | 11 |
| 2015 | 16 |
| 2016 | 10 |
| 2017 | 14 |
| 2018 | 12 |
| 2019 | 19 |
| 2020 | 15 |
| 2021 | 26 |
| 2022 | 24 |
| 2023 | 21 |
| 2024 | 7 |