| Year | Count |
|---|---|
| 1915 | 12 |
| 1983 | 6 |
| 1986 | 7 |
| 1987 | 30 |
| 1988 | 5 |
| 1990 | 32 |
| 1991 | 9 |
| 1992 | 7 |
| 1993 | 7 |
| 1994 | 21 |
| 1995 | 8 |
| 1996 | 35 |
| 1997 | 28 |
| 1998 | 47 |
| 1999 | 37 |
| 2000 | 47 |
| 2001 | 82 |
| 2002 | 70 |
| 2003 | 151 |
| 2004 | 176 |
| 2005 | 280 |
| 2006 | 267 |
| 2007 | 393 |
| 2008 | 351 |
| 2009 | 276 |
| 2010 | 331 |
| 2011 | 427 |
| 2012 | 591 |
| 2013 | 615 |
| 2014 | 684 |
| 2015 | 779 |
| 2016 | 1,233 |
| 2017 | 1,408 |
| 2018 | 1,428 |
| 2019 | 1,416 |
| 2020 | 1,382 |
| 2021 | 1,574 |
| 2022 | 1,793 |
| 2023 | 1,504 |
| 2024 | 1,487 |