| Year | Count |
|---|---|
| 1920 | 5 |
| 1923 | 10 |
| 1929 | 8 |
| 1939 | 6 |
| 1943 | 6 |
| 1944 | 5 |
| 1949 | 6 |
| 1955 | 24 |
| 1957 | 14 |
| 1966 | 12 |
| 1978 | 5 |
| 1979 | 5 |
| 1980 | 7 |
| 1981 | 7 |
| 1984 | 6 |
| 1987 | 8 |
| 1988 | 5 |
| 1989 | 7 |
| 1991 | 17 |
| 1992 | 21 |
| 1993 | 66 |
| 1994 | 55 |
| 1995 | 41 |
| 1996 | 63 |
| 1997 | 40 |
| 1998 | 56 |
| 1999 | 50 |
| 2000 | 95 |
| 2001 | 116 |
| 2002 | 172 |
| 2003 | 174 |
| 2004 | 187 |
| 2005 | 217 |
| 2006 | 240 |
| 2007 | 357 |
| 2008 | 329 |
| 2009 | 401 |
| 2010 | 435 |
| 2011 | 979 |
| 2012 | 955 |
| 2013 | 889 |
| 2014 | 817 |
| 2015 | 1,376 |
| 2016 | 1,538 |
| 2017 | 1,087 |
| 2018 | 1,211 |
| 2019 | 1,248 |
| 2020 | 814 |
| 2021 | 935 |
| 2022 | 1,044 |
| 2023 | 940 |
| 2024 | 1,024 |