| Year | Count |
|---|---|
| 1912 | 10 |
| 1916 | 6 |
| 1917 | 9 |
| 1918 | 10 |
| 1919 | 5 |
| 1920 | 6 |
| 1921 | 7 |
| 1923 | 7 |
| 1924 | 13 |
| 1925 | 6 |
| 1927 | 11 |
| 1928 | 7 |
| 1968 | 8 |
| 1970 | 6 |
| 1977 | 9 |
| 1980 | 5 |
| 1982 | 5 |
| 1983 | 5 |
| 1985 | 5 |
| 1986 | 5 |
| 1987 | 7 |
| 1988 | 6 |
| 1990 | 14 |
| 1991 | 12 |
| 1992 | 15 |
| 1993 | 14 |
| 1994 | 27 |
| 1995 | 44 |
| 1996 | 43 |
| 1997 | 37 |
| 1998 | 53 |
| 1999 | 44 |
| 2000 | 41 |
| 2001 | 112 |
| 2002 | 60 |
| 2003 | 65 |
| 2004 | 68 |
| 2005 | 78 |
| 2006 | 105 |
| 2007 | 99 |
| 2008 | 162 |
| 2009 | 78 |
| 2010 | 56 |
| 2011 | 65 |
| 2012 | 75 |
| 2013 | 32 |
| 2014 | 55 |
| 2015 | 43 |
| 2016 | 117 |
| 2017 | 134 |
| 2018 | 110 |
| 2019 | 61 |
| 2020 | 64 |
| 2021 | 38 |
| 2022 | 78 |
| 2023 | 76 |
| 2024 | 31 |