| Year | Count |
|---|---|
| 1924 | 8 |
| 1925 | 6 |
| 1928 | 5 |
| 1930 | 10 |
| 1944 | 5 |
| 1946 | 5 |
| 1947 | 18 |
| 1948 | 5 |
| 1955 | 21 |
| 1965 | 18 |
| 1968 | 10 |
| 1970 | 5 |
| 1971 | 5 |
| 1973 | 6 |
| 1974 | 6 |
| 1976 | 5 |
| 1978 | 15 |
| 1979 | 10 |
| 1980 | 6 |
| 1983 | 6 |
| 1984 | 9 |
| 1985 | 6 |
| 1987 | 6 |
| 1989 | 6 |
| 1990 | 7 |
| 1992 | 5 |
| 1993 | 8 |
| 1994 | 10 |
| 1995 | 6 |
| 1996 | 13 |
| 1997 | 11 |
| 1998 | 5 |
| 1999 | 7 |
| 2000 | 22 |
| 2001 | 16 |
| 2005 | 6 |
| 2006 | 6 |
| 2007 | 14 |
| 2008 | 39 |
| 2009 | 12 |
| 2010 | 15 |
| 2011 | 18 |
| 2012 | 12 |
| 2013 | 10 |
| 2014 | 10 |
| 2015 | 16 |
| 2016 | 16 |
| 2017 | 8 |
| 2018 | 10 |
| 2020 | 5 |
| 2021 | 5 |
| 2022 | 8 |
| 2023 | 7 |
| 2024 | 8 |