| Year | Count |
|---|---|
| 1914 | 6 |
| 1915 | 7 |
| 1918 | 6 |
| 1920 | 6 |
| 1921 | 6 |
| 1923 | 7 |
| 1924 | 6 |
| 1925 | 7 |
| 1926 | 5 |
| 1927 | 7 |
| 1928 | 9 |
| 1929 | 8 |
| 1930 | 10 |
| 1931 | 26 |
| 1936 | 12 |
| 1939 | 5 |
| 1941 | 8 |
| 1942 | 7 |
| 1943 | 5 |
| 1947 | 21 |
| 1948 | 10 |
| 1949 | 5 |
| 1955 | 24 |
| 1959 | 12 |
| 1962 | 16 |
| 1963 | 10 |
| 1964 | 12 |
| 1965 | 20 |
| 1966 | 14 |
| 1967 | 10 |
| 1969 | 11 |
| 1970 | 7 |
| 1971 | 5 |
| 1972 | 6 |
| 1973 | 8 |
| 1974 | 5 |
| 1975 | 9 |
| 1979 | 7 |
| 1980 | 6 |
| 1981 | 8 |
| 1983 | 5 |
| 1984 | 10 |
| 1985 | 9 |
| 1986 | 8 |
| 1988 | 7 |
| 1989 | 6 |
| 1990 | 5 |
| 1991 | 7 |
| 1992 | 10 |
| 1993 | 5 |
| 1994 | 7 |
| 1995 | 12 |
| 1997 | 8 |
| 1998 | 5 |
| 1999 | 6 |
| 2000 | 9 |
| 2005 | 7 |
| 2008 | 5 |
| 2010 | 5 |
| 2011 | 10 |
| 2014 | 12 |