| Year | Count |
|---|---|
| 1922 | 10 |
| 1929 | 12 |
| 1930 | 10 |
| 1943 | 5 |
| 1946 | 7 |
| 1947 | 6 |
| 1949 | 6 |
| 1952 | 6 |
| 1953 | 5 |
| 1954 | 5 |
| 1957 | 12 |
| 1958 | 12 |
| 1959 | 14 |
| 1960 | 12 |
| 1961 | 6 |
| 1966 | 5 |
| 1979 | 10 |
| 1985 | 5 |
| 1987 | 8 |
| 1989 | 5 |
| 1990 | 13 |
| 1991 | 14 |
| 1992 | 17 |
| 1994 | 8 |
| 1995 | 12 |
| 1996 | 10 |
| 1997 | 16 |
| 1998 | 14 |
| 1999 | 10 |
| 2000 | 9 |
| 2001 | 14 |
| 2002 | 7 |
| 2003 | 9 |
| 2004 | 6 |
| 2005 | 7 |
| 2006 | 11 |
| 2007 | 8 |
| 2008 | 5 |
| 2010 | 9 |
| 2011 | 7 |
| 2012 | 6 |
| 2013 | 12 |
| 2015 | 21 |
| 2016 | 18 |
| 2018 | 10 |
| 2019 | 14 |
| 2020 | 12 |
| 2021 | 10 |