| Year | Count |
|---|---|
| 1920 | 5 |
| 1922 | 5 |
| 1926 | 6 |
| 1927 | 7 |
| 1929 | 5 |
| 1930 | 10 |
| 1939 | 5 |
| 1942 | 7 |
| 1944 | 8 |
| 1946 | 5 |
| 1948 | 8 |
| 1954 | 21 |
| 1955 | 30 |
| 1957 | 16 |
| 1959 | 10 |
| 1960 | 12 |
| 1965 | 14 |
| 1967 | 16 |
| 1972 | 5 |
| 1974 | 9 |
| 1975 | 11 |
| 1976 | 8 |
| 1977 | 7 |
| 1979 | 7 |
| 1980 | 7 |
| 1981 | 8 |
| 1982 | 9 |
| 1983 | 9 |
| 1985 | 10 |
| 1986 | 8 |
| 1987 | 11 |
| 1988 | 5 |
| 1989 | 7 |
| 1990 | 11 |
| 1991 | 16 |
| 1992 | 7 |
| 1993 | 8 |
| 1994 | 22 |
| 1995 | 10 |
| 1996 | 8 |
| 1997 | 19 |
| 1998 | 8 |
| 1999 | 10 |
| 2000 | 9 |
| 2001 | 41 |
| 2002 | 6 |
| 2005 | 11 |
| 2006 | 11 |
| 2007 | 27 |
| 2008 | 26 |
| 2009 | 11 |
| 2010 | 6 |
| 2011 | 16 |
| 2012 | 14 |
| 2013 | 14 |
| 2015 | 16 |
| 2016 | 14 |
| 2017 | 5 |
| 2018 | 8 |
| 2019 | 9 |
| 2022 | 6 |
| 2024 | 5 |