| Year | Count |
|---|---|
| 1914 | 5 |
| 1916 | 6 |
| 1917 | 5 |
| 1918 | 5 |
| 1921 | 6 |
| 1922 | 5 |
| 1925 | 6 |
| 1932 | 10 |
| 1934 | 9 |
| 1937 | 5 |
| 1938 | 5 |
| 1939 | 6 |
| 1941 | 5 |
| 1942 | 6 |
| 1946 | 6 |
| 1947 | 9 |
| 1950 | 7 |
| 1954 | 5 |
| 1978 | 5 |
| 1981 | 8 |
| 1985 | 6 |
| 1989 | 10 |
| 1990 | 10 |
| 1991 | 6 |
| 1992 | 9 |
| 1993 | 9 |
| 1995 | 6 |
| 1997 | 6 |
| 1998 | 8 |
| 1999 | 18 |
| 2000 | 15 |
| 2001 | 26 |
| 2005 | 15 |
| 2006 | 23 |
| 2007 | 45 |
| 2008 | 48 |
| 2009 | 12 |
| 2010 | 14 |
| 2011 | 22 |
| 2012 | 26 |
| 2013 | 12 |
| 2014 | 14 |
| 2015 | 16 |
| 2016 | 18 |
| 2017 | 6 |
| 2018 | 5 |
| 2019 | 5 |
| 2020 | 19 |
| 2021 | 5 |
| 2022 | 10 |
| 2023 | 7 |
| 2024 | 11 |