| Year | Count |
|---|---|
| 1916 | 5 |
| 1925 | 16 |
| 1926 | 15 |
| 1928 | 5 |
| 1929 | 10 |
| 1931 | 5 |
| 1938 | 6 |
| 1948 | 5 |
| 1953 | 6 |
| 1954 | 6 |
| 1955 | 6 |
| 1958 | 10 |
| 1973 | 6 |
| 1976 | 5 |
| 1977 | 17 |
| 1978 | 5 |
| 1979 | 5 |
| 1980 | 24 |
| 1981 | 25 |
| 1982 | 15 |
| 1985 | 18 |
| 1987 | 5 |
| 1992 | 5 |
| 1993 | 36 |
| 1995 | 6 |
| 1996 | 6 |
| 1998 | 5 |
| 1999 | 9 |
| 2000 | 17 |
| 2001 | 32 |
| 2002 | 55 |
| 2003 | 52 |
| 2004 | 101 |
| 2005 | 168 |
| 2006 | 151 |
| 2007 | 243 |
| 2008 | 330 |
| 2009 | 242 |
| 2010 | 255 |
| 2011 | 309 |
| 2012 | 460 |
| 2013 | 393 |
| 2014 | 389 |
| 2015 | 491 |
| 2016 | 514 |
| 2017 | 598 |
| 2018 | 549 |
| 2019 | 698 |
| 2020 | 571 |
| 2021 | 624 |
| 2022 | 721 |
| 2023 | 687 |
| 2024 | 740 |