| Year | Count |
|---|---|
| 1949 | 5 |
| 1951 | 10 |
| 1952 | 18 |
| 1953 | 5 |
| 1954 | 17 |
| 1956 | 5 |
| 1957 | 5 |
| 1963 | 5 |
| 1964 | 10 |
| 1978 | 5 |
| 1979 | 6 |
| 1980 | 7 |
| 1982 | 5 |
| 1983 | 7 |
| 1985 | 5 |
| 1995 | 6 |
| 1996 | 8 |
| 1997 | 11 |
| 1998 | 9 |
| 1999 | 7 |
| 2000 | 6 |
| 2001 | 5 |
| 2002 | 10 |
| 2003 | 8 |
| 2004 | 23 |
| 2005 | 12 |
| 2006 | 14 |
| 2007 | 10 |
| 2008 | 11 |
| 2009 | 8 |
| 2010 | 13 |
| 2011 | 8 |
| 2012 | 7 |
| 2013 | 8 |
| 2014 | 15 |
| 2015 | 8 |
| 2016 | 7 |
| 2018 | 6 |
| 2019 | 9 |
| 2022 | 7 |