| Year | Count |
|---|---|
| 1920 | 15 |
| 1979 | 5 |
| 1981 | 21 |
| 1982 | 18 |
| 1983 | 57 |
| 1984 | 108 |
| 1985 | 143 |
| 1986 | 234 |
| 1987 | 433 |
| 1988 | 518 |
| 1989 | 1,004 |
| 1990 | 987 |
| 1991 | 1,375 |
| 1992 | 1,262 |
| 1993 | 1,435 |
| 1994 | 1,258 |
| 1995 | 1,160 |
| 1996 | 1,209 |
| 1997 | 1,003 |
| 1998 | 1,075 |
| 1999 | 713 |
| 2000 | 699 |
| 2001 | 615 |
| 2002 | 489 |
| 2003 | 508 |
| 2004 | 568 |
| 2005 | 465 |
| 2006 | 429 |
| 2007 | 486 |
| 2008 | 413 |
| 2009 | 336 |
| 2010 | 320 |
| 2011 | 292 |
| 2012 | 232 |
| 2013 | 182 |
| 2014 | 200 |
| 2015 | 249 |
| 2016 | 238 |
| 2017 | 192 |
| 2018 | 136 |
| 2019 | 115 |
| 2020 | 72 |
| 2021 | 72 |
| 2022 | 85 |
| 2023 | 80 |
| 2024 | 39 |