| Year | Count |
|---|---|
| 1916 | 5 |
| 1918 | 5 |
| 1962 | 5 |
| 1968 | 6 |
| 1969 | 7 |
| 1970 | 8 |
| 1973 | 6 |
| 1975 | 5 |
| 1977 | 12 |
| 1978 | 12 |
| 1981 | 6 |
| 1983 | 5 |
| 1984 | 8 |
| 1985 | 5 |
| 1986 | 6 |
| 1987 | 16 |
| 1988 | 14 |
| 1989 | 13 |
| 1990 | 17 |
| 1991 | 10 |
| 1992 | 10 |
| 1993 | 10 |
| 1994 | 8 |
| 1995 | 17 |
| 1996 | 12 |
| 1997 | 26 |
| 1998 | 18 |
| 1999 | 12 |
| 2000 | 7 |
| 2001 | 6 |
| 2003 | 11 |
| 2004 | 5 |
| 2005 | 9 |
| 2006 | 9 |
| 2007 | 12 |
| 2008 | 10 |
| 2009 | 15 |
| 2010 | 17 |
| 2011 | 12 |
| 2013 | 5 |
| 2014 | 12 |
| 2015 | 42 |
| 2017 | 36 |
| 2018 | 11 |
| 2019 | 16 |
| 2020 | 26 |
| 2021 | 16 |
| 2022 | 18 |
| 2023 | 12 |
| 2024 | 10 |