| Year | Count |
|---|---|
| 1919 | 20 |
| 1965 | 10 |
| 1970 | 5 |
| 1977 | 24 |
| 1979 | 7 |
| 1980 | 5 |
| 1981 | 5 |
| 1982 | 36 |
| 1983 | 58 |
| 1984 | 46 |
| 1985 | 47 |
| 1986 | 22 |
| 1987 | 47 |
| 1988 | 56 |
| 1989 | 66 |
| 1990 | 99 |
| 1991 | 56 |
| 1992 | 80 |
| 1993 | 55 |
| 1994 | 120 |
| 1995 | 200 |
| 1996 | 211 |
| 1997 | 210 |
| 1998 | 216 |
| 1999 | 169 |
| 2000 | 242 |
| 2001 | 253 |
| 2002 | 204 |
| 2003 | 197 |
| 2004 | 229 |
| 2005 | 197 |
| 2006 | 200 |
| 2007 | 234 |
| 2008 | 239 |
| 2009 | 219 |
| 2010 | 229 |
| 2011 | 173 |
| 2012 | 178 |
| 2013 | 140 |
| 2014 | 99 |
| 2015 | 115 |
| 2016 | 116 |
| 2017 | 81 |
| 2018 | 111 |
| 2019 | 76 |
| 2020 | 77 |
| 2021 | 51 |
| 2022 | 52 |
| 2023 | 17 |
| 2024 | 16 |