| Year | Count |
|---|---|
| 1922 | 14 |
| 1923 | 5 |
| 1924 | 6 |
| 1925 | 6 |
| 1927 | 5 |
| 1936 | 5 |
| 1937 | 5 |
| 1938 | 5 |
| 1942 | 7 |
| 1944 | 6 |
| 1946 | 7 |
| 1949 | 6 |
| 1956 | 12 |
| 1960 | 14 |
| 1963 | 10 |
| 1965 | 14 |
| 1966 | 16 |
| 1967 | 10 |
| 1968 | 12 |
| 1969 | 5 |
| 1971 | 8 |
| 1972 | 6 |
| 1973 | 7 |
| 1976 | 5 |
| 1979 | 15 |
| 1980 | 8 |
| 1983 | 6 |
| 1984 | 8 |
| 1986 | 7 |
| 1987 | 12 |
| 1988 | 7 |
| 1989 | 9 |
| 1990 | 5 |
| 1993 | 10 |
| 1994 | 18 |
| 1995 | 28 |
| 1996 | 19 |
| 1997 | 24 |
| 1998 | 35 |
| 1999 | 53 |
| 2000 | 25 |
| 2001 | 46 |
| 2002 | 6 |
| 2003 | 25 |
| 2004 | 33 |
| 2005 | 19 |
| 2006 | 35 |
| 2007 | 19 |
| 2008 | 43 |
| 2009 | 13 |
| 2010 | 19 |
| 2011 | 14 |
| 2012 | 30 |
| 2013 | 10 |
| 2014 | 12 |
| 2015 | 16 |
| 2016 | 20 |
| 2017 | 6 |
| 2018 | 6 |
| 2019 | 8 |
| 2020 | 8 |
| 2024 | 6 |