| Year | Count |
|---|---|
| 1915 | 10 |
| 1917 | 35 |
| 1918 | 21 |
| 1919 | 10 |
| 1920 | 5 |
| 1921 | 5 |
| 1922 | 42 |
| 1923 | 5 |
| 1924 | 5 |
| 1925 | 37 |
| 1926 | 6 |
| 1928 | 20 |
| 1929 | 27 |
| 1930 | 24 |
| 1931 | 10 |
| 1941 | 5 |
| 1944 | 18 |
| 1945 | 5 |
| 1946 | 10 |
| 1947 | 5 |
| 1949 | 5 |
| 1953 | 10 |
| 1954 | 15 |
| 1957 | 10 |
| 1965 | 5 |
| 1974 | 5 |
| 1975 | 5 |
| 1976 | 10 |
| 1977 | 5 |
| 1979 | 7 |
| 1980 | 6 |
| 1981 | 22 |
| 1982 | 8 |
| 1983 | 5 |
| 1984 | 9 |
| 1985 | 13 |
| 1987 | 8 |
| 1988 | 19 |
| 1989 | 9 |
| 1990 | 18 |
| 1991 | 5 |
| 1992 | 47 |
| 1993 | 21 |
| 1994 | 39 |
| 1995 | 30 |
| 1996 | 38 |
| 1997 | 24 |
| 1998 | 24 |
| 1999 | 50 |
| 2000 | 14 |
| 2001 | 12 |
| 2003 | 42 |
| 2004 | 10 |
| 2005 | 10 |
| 2006 | 7 |
| 2007 | 20 |
| 2008 | 12 |
| 2009 | 17 |
| 2010 | 12 |
| 2011 | 20 |
| 2013 | 12 |
| 2014 | 10 |
| 2015 | 17 |
| 2016 | 5 |