| Year | Count |
|---|---|
| 1912 | 5 |
| 1916 | 8 |
| 1917 | 5 |
| 1918 | 10 |
| 1919 | 5 |
| 1922 | 16 |
| 1923 | 5 |
| 1929 | 5 |
| 1931 | 7 |
| 1967 | 5 |
| 1970 | 5 |
| 1971 | 5 |
| 1976 | 5 |
| 1977 | 5 |
| 1978 | 30 |
| 1980 | 5 |
| 1982 | 6 |
| 1985 | 12 |
| 1986 | 6 |
| 1987 | 24 |
| 1988 | 10 |
| 1989 | 10 |
| 1990 | 12 |
| 1991 | 17 |
| 1992 | 12 |
| 1993 | 21 |
| 1994 | 25 |
| 1995 | 27 |
| 1996 | 27 |
| 1997 | 17 |
| 1998 | 37 |
| 1999 | 11 |
| 2000 | 26 |
| 2001 | 9 |
| 2002 | 37 |
| 2003 | 28 |
| 2004 | 52 |
| 2005 | 61 |
| 2006 | 60 |
| 2007 | 27 |
| 2008 | 51 |
| 2009 | 36 |
| 2010 | 66 |
| 2011 | 30 |
| 2012 | 52 |
| 2013 | 21 |
| 2014 | 37 |
| 2015 | 64 |
| 2016 | 30 |
| 2017 | 61 |
| 2018 | 25 |
| 2019 | 25 |
| 2020 | 56 |
| 2021 | 10 |
| 2022 | 39 |
| 2023 | 29 |
| 2024 | 55 |