| Year | Count |
|---|---|
| 1915 | 5 |
| 1917 | 5 |
| 1918 | 10 |
| 1919 | 10 |
| 1920 | 5 |
| 1925 | 24 |
| 1926 | 5 |
| 1927 | 5 |
| 1929 | 5 |
| 1930 | 6 |
| 1931 | 6 |
| 1932 | 7 |
| 1933 | 6 |
| 1966 | 6 |
| 1969 | 6 |
| 1970 | 17 |
| 1973 | 7 |
| 1974 | 6 |
| 1975 | 23 |
| 1976 | 10 |
| 1977 | 24 |
| 1978 | 12 |
| 1979 | 6 |
| 1980 | 33 |
| 1981 | 26 |
| 1982 | 12 |
| 1983 | 58 |
| 1984 | 15 |
| 1985 | 28 |
| 1986 | 59 |
| 1987 | 63 |
| 1988 | 61 |
| 1989 | 64 |
| 1990 | 84 |
| 1991 | 109 |
| 1992 | 87 |
| 1993 | 101 |
| 1994 | 51 |
| 1995 | 58 |
| 1996 | 37 |
| 1997 | 77 |
| 1998 | 19 |
| 1999 | 53 |
| 2000 | 33 |
| 2001 | 20 |
| 2002 | 29 |
| 2003 | 25 |
| 2004 | 32 |
| 2005 | 16 |
| 2006 | 33 |
| 2007 | 26 |
| 2008 | 36 |
| 2009 | 22 |
| 2010 | 16 |
| 2011 | 23 |
| 2013 | 20 |
| 2014 | 27 |
| 2015 | 13 |
| 2018 | 10 |
| 2019 | 15 |
| 2020 | 10 |