| Year | Count |
|---|---|
| 1910 | 5 |
| 1911 | 5 |
| 1913 | 10 |
| 1914 | 15 |
| 1915 | 11 |
| 1916 | 8 |
| 1917 | 9 |
| 1918 | 11 |
| 1919 | 9 |
| 1920 | 5 |
| 1922 | 8 |
| 1931 | 5 |
| 1936 | 7 |
| 1942 | 6 |
| 1955 | 5 |
| 1957 | 5 |
| 1962 | 6 |
| 1974 | 5 |
| 1976 | 6 |
| 1977 | 7 |
| 1978 | 7 |
| 1981 | 7 |
| 1982 | 6 |
| 1983 | 6 |
| 1984 | 8 |
| 1987 | 8 |
| 1989 | 12 |
| 1992 | 7 |
| 1993 | 6 |
| 1994 | 5 |
| 1995 | 10 |
| 1996 | 5 |
| 1998 | 6 |
| 2001 | 5 |
| 2004 | 5 |
| 2005 | 11 |
| 2007 | 6 |
| 2008 | 8 |
| 2009 | 12 |
| 2010 | 11 |
| 2011 | 12 |
| 2012 | 23 |
| 2013 | 14 |
| 2014 | 17 |
| 2015 | 19 |
| 2016 | 48 |
| 2017 | 42 |
| 2018 | 58 |
| 2019 | 26 |
| 2020 | 9 |
| 2021 | 11 |
| 2022 | 8 |
| 2023 | 6 |
| 2024 | 12 |