| Year | Count |
|---|---|
| 1919 | 5 |
| 1923 | 5 |
| 1924 | 9 |
| 1925 | 6 |
| 1928 | 12 |
| 1930 | 12 |
| 1932 | 12 |
| 1937 | 5 |
| 1963 | 5 |
| 1964 | 5 |
| 1974 | 113 |
| 1975 | 342 |
| 1976 | 373 |
| 1977 | 139 |
| 1978 | 54 |
| 1979 | 32 |
| 1980 | 10 |
| 1981 | 26 |
| 1982 | 32 |
| 1983 | 6 |
| 1986 | 12 |
| 1987 | 20 |
| 1988 | 16 |
| 1991 | 24 |
| 1993 | 5 |
| 1994 | 5 |
| 1997 | 7 |
| 1998 | 6 |
| 1999 | 29 |
| 2000 | 36 |
| 2001 | 19 |
| 2002 | 36 |
| 2003 | 45 |
| 2004 | 141 |
| 2005 | 167 |
| 2006 | 264 |
| 2007 | 320 |
| 2008 | 381 |
| 2009 | 390 |
| 2010 | 367 |
| 2011 | 518 |
| 2012 | 529 |
| 2013 | 556 |
| 2014 | 649 |
| 2015 | 687 |
| 2016 | 842 |
| 2017 | 891 |
| 2018 | 830 |
| 2019 | 752 |
| 2020 | 729 |
| 2021 | 844 |
| 2022 | 950 |
| 2023 | 1,068 |
| 2024 | 1,128 |