| Year | Count |
|---|---|
| 1915 | 12 |
| 1931 | 15 |
| 1934 | 6 |
| 1937 | 7 |
| 1939 | 5 |
| 1941 | 5 |
| 1942 | 5 |
| 1943 | 5 |
| 1945 | 5 |
| 1948 | 7 |
| 1949 | 5 |
| 1952 | 5 |
| 1953 | 5 |
| 1956 | 5 |
| 1957 | 5 |
| 1958 | 12 |
| 1959 | 18 |
| 1960 | 31 |
| 1961 | 5 |
| 1962 | 22 |
| 1963 | 21 |
| 1965 | 5 |
| 1966 | 14 |
| 1970 | 10 |
| 1973 | 10 |
| 1974 | 5 |
| 1977 | 5 |
| 1978 | 14 |
| 1980 | 5 |
| 1981 | 5 |
| 1982 | 6 |
| 1983 | 5 |
| 1984 | 5 |
| 1985 | 25 |
| 1987 | 7 |
| 1988 | 5 |
| 1989 | 7 |
| 1990 | 25 |
| 1991 | 11 |
| 1992 | 14 |
| 1993 | 30 |
| 1994 | 18 |
| 1995 | 22 |
| 1996 | 10 |
| 1997 | 5 |
| 1998 | 7 |
| 1999 | 15 |
| 2000 | 25 |
| 2001 | 26 |
| 2002 | 20 |
| 2003 | 10 |
| 2004 | 12 |
| 2005 | 5 |
| 2006 | 19 |
| 2007 | 6 |
| 2008 | 35 |
| 2009 | 12 |
| 2010 | 22 |
| 2011 | 25 |
| 2012 | 27 |
| 2013 | 5 |
| 2014 | 10 |
| 2015 | 10 |
| 2019 | 7 |
| 2020 | 5 |
| 2021 | 7 |