| Year | Count |
|---|---|
| 1925 | 12 |
| 1962 | 5 |
| 1965 | 5 |
| 1967 | 5 |
| 1969 | 5 |
| 1970 | 5 |
| 1977 | 10 |
| 1978 | 10 |
| 1979 | 10 |
| 1981 | 7 |
| 1984 | 7 |
| 1986 | 6 |
| 1987 | 9 |
| 1988 | 16 |
| 1989 | 22 |
| 1990 | 38 |
| 1991 | 33 |
| 1992 | 38 |
| 1993 | 30 |
| 1994 | 34 |
| 1995 | 31 |
| 1996 | 37 |
| 1997 | 33 |
| 1998 | 29 |
| 1999 | 29 |
| 2000 | 35 |
| 2001 | 26 |
| 2002 | 32 |
| 2003 | 40 |
| 2004 | 25 |
| 2005 | 35 |
| 2006 | 24 |
| 2007 | 29 |
| 2008 | 22 |
| 2009 | 17 |
| 2010 | 12 |
| 2011 | 12 |
| 2012 | 9 |
| 2013 | 16 |
| 2014 | 17 |
| 2015 | 39 |
| 2016 | 48 |
| 2017 | 39 |
| 2018 | 18 |
| 2019 | 34 |
| 2020 | 20 |
| 2021 | 34 |
| 2022 | 22 |
| 2023 | 22 |
| 2024 | 30 |