| Year | Count |
|---|---|
| 1933 | 15 |
| 1935 | 18 |
| 1939 | 18 |
| 1947 | 15 |
| 1951 | 14 |
| 1954 | 7 |
| 1955 | 5 |
| 1958 | 5 |
| 1971 | 10 |
| 1984 | 11 |
| 1986 | 5 |
| 1988 | 5 |
| 1989 | 6 |
| 1990 | 26 |
| 1991 | 20 |
| 1992 | 11 |
| 1994 | 27 |
| 1995 | 17 |
| 1996 | 15 |
| 1997 | 25 |
| 1998 | 22 |
| 1999 | 6 |
| 2000 | 17 |
| 2001 | 39 |
| 2002 | 24 |
| 2003 | 18 |
| 2004 | 27 |
| 2006 | 18 |
| 2007 | 6 |
| 2008 | 12 |
| 2010 | 11 |
| 2011 | 5 |
| 2012 | 16 |
| 2013 | 20 |
| 2014 | 6 |
| 2015 | 10 |
| 2019 | 6 |
| 2022 | 5 |