| Year | Count |
|---|---|
| 1920 | 22 |
| 1922 | 14 |
| 1935 | 5 |
| 1987 | 5 |
| 1988 | 5 |
| 1989 | 11 |
| 1990 | 5 |
| 1991 | 10 |
| 1992 | 13 |
| 1993 | 35 |
| 1994 | 101 |
| 1995 | 142 |
| 1996 | 80 |
| 1997 | 166 |
| 1998 | 134 |
| 1999 | 124 |
| 2000 | 54 |
| 2001 | 85 |
| 2002 | 76 |
| 2003 | 43 |
| 2004 | 49 |
| 2005 | 48 |
| 2006 | 16 |
| 2007 | 40 |
| 2008 | 42 |
| 2009 | 16 |
| 2010 | 17 |
| 2011 | 18 |
| 2014 | 5 |
| 2015 | 10 |
| 2017 | 12 |
| 2021 | 5 |