| Year | Count |
|---|---|
| 1952 | 5 |
| 1969 | 7 |
| 1970 | 5 |
| 1971 | 5 |
| 1973 | 7 |
| 1974 | 9 |
| 1975 | 10 |
| 1977 | 10 |
| 1978 | 10 |
| 1979 | 10 |
| 1981 | 5 |
| 1983 | 6 |
| 1984 | 5 |
| 1985 | 9 |
| 1987 | 5 |
| 1988 | 5 |
| 1989 | 7 |
| 1990 | 5 |
| 1994 | 10 |
| 1996 | 12 |
| 1997 | 8 |
| 1998 | 6 |
| 1999 | 7 |
| 2000 | 8 |
| 2001 | 8 |
| 2002 | 11 |
| 2003 | 6 |
| 2004 | 7 |
| 2005 | 7 |
| 2006 | 8 |
| 2007 | 12 |
| 2008 | 5 |
| 2009 | 7 |
| 2010 | 7 |
| 2011 | 9 |
| 2012 | 11 |
| 2014 | 9 |
| 2015 | 24 |
| 2016 | 30 |
| 2017 | 24 |
| 2018 | 12 |
| 2019 | 10 |
| 2020 | 14 |
| 2023 | 14 |