| Year | Count |
|---|---|
| 1920 | 6 |
| 1954 | 5 |
| 1955 | 7 |
| 1956 | 7 |
| 1957 | 5 |
| 1959 | 9 |
| 1960 | 10 |
| 1961 | 7 |
| 1968 | 5 |
| 1971 | 11 |
| 1975 | 5 |
| 1976 | 5 |
| 1977 | 9 |
| 1978 | 12 |
| 1979 | 7 |
| 1982 | 6 |
| 1985 | 5 |
| 1986 | 5 |
| 1987 | 14 |
| 1988 | 11 |
| 1989 | 6 |
| 1990 | 8 |
| 1991 | 6 |
| 1992 | 6 |
| 1994 | 12 |
| 1995 | 6 |
| 1996 | 8 |
| 1997 | 8 |
| 1998 | 11 |
| 2000 | 9 |
| 2001 | 10 |
| 2003 | 6 |
| 2004 | 10 |
| 2005 | 15 |
| 2006 | 15 |
| 2007 | 16 |
| 2008 | 11 |
| 2009 | 9 |
| 2010 | 9 |
| 2011 | 9 |
| 2012 | 13 |
| 2014 | 9 |
| 2015 | 8 |
| 2016 | 12 |
| 2017 | 20 |
| 2019 | 7 |
| 2020 | 8 |
| 2021 | 10 |
| 2022 | 7 |
| 2023 | 9 |