| Year | Count |
|---|---|
| 1917 | 7 |
| 1954 | 5 |
| 1959 | 5 |
| 1963 | 7 |
| 1964 | 8 |
| 1970 | 6 |
| 1974 | 5 |
| 1978 | 5 |
| 1983 | 7 |
| 1987 | 8 |
| 1988 | 8 |
| 1989 | 7 |
| 1990 | 27 |
| 1991 | 51 |
| 1992 | 79 |
| 1993 | 55 |
| 1994 | 87 |
| 1995 | 70 |
| 1996 | 59 |
| 1997 | 83 |
| 1998 | 67 |
| 1999 | 71 |
| 2000 | 74 |
| 2001 | 59 |
| 2002 | 66 |
| 2003 | 50 |
| 2004 | 36 |
| 2005 | 43 |
| 2006 | 25 |
| 2007 | 22 |
| 2008 | 36 |
| 2009 | 27 |
| 2010 | 23 |
| 2011 | 27 |
| 2012 | 19 |
| 2013 | 29 |
| 2014 | 22 |
| 2015 | 25 |
| 2016 | 70 |
| 2017 | 54 |
| 2018 | 40 |
| 2019 | 44 |
| 2020 | 17 |
| 2021 | 20 |
| 2022 | 21 |
| 2023 | 15 |
| 2024 | 33 |