| Year | Count |
|---|---|
| 1918 | 131 |
| 1919 | 15 |
| 1974 | 17 |
| 1975 | 27 |
| 1976 | 313 |
| 1978 | 13 |
| 1979 | 6 |
| 1981 | 12 |
| 1986 | 52 |
| 1988 | 10 |
| 1989 | 10 |
| 1991 | 5 |
| 1994 | 25 |
| 1995 | 53 |
| 1996 | 12 |
| 1997 | 33 |
| 1998 | 74 |
| 1999 | 125 |
| 2000 | 166 |
| 2001 | 280 |
| 2002 | 592 |
| 2003 | 618 |
| 2004 | 996 |
| 2005 | 824 |
| 2006 | 669 |
| 2007 | 570 |
| 2008 | 564 |
| 2009 | 656 |
| 2010 | 660 |
| 2011 | 571 |
| 2012 | 616 |
| 2013 | 641 |
| 2014 | 552 |
| 2015 | 640 |
| 2016 | 675 |
| 2017 | 639 |
| 2018 | 552 |
| 2019 | 444 |
| 2020 | 450 |
| 2021 | 515 |
| 2022 | 426 |
| 2023 | 331 |
| 2024 | 245 |