| Year | Count |
|---|---|
| 1912 | 6 |
| 1914 | 5 |
| 1918 | 7 |
| 1920 | 10 |
| 1922 | 9 |
| 1923 | 9 |
| 1924 | 12 |
| 1925 | 5 |
| 1926 | 7 |
| 1927 | 8 |
| 1928 | 5 |
| 1929 | 8 |
| 1930 | 6 |
| 1939 | 8 |
| 1941 | 7 |
| 1943 | 5 |
| 1944 | 8 |
| 1945 | 7 |
| 1946 | 6 |
| 1947 | 18 |
| 1948 | 7 |
| 1949 | 8 |
| 1955 | 30 |
| 1956 | 12 |
| 1957 | 16 |
| 1958 | 16 |
| 1960 | 12 |
| 1963 | 14 |
| 1964 | 10 |
| 1965 | 16 |
| 1966 | 12 |
| 1967 | 14 |
| 1968 | 14 |
| 1969 | 5 |
| 1971 | 5 |
| 1972 | 6 |
| 1973 | 15 |
| 1974 | 6 |
| 1975 | 6 |
| 1976 | 8 |
| 1978 | 7 |
| 1981 | 5 |
| 1984 | 7 |
| 1985 | 12 |
| 1986 | 8 |
| 1987 | 6 |
| 1988 | 7 |
| 1989 | 6 |
| 1990 | 7 |
| 1991 | 8 |
| 1992 | 7 |
| 1994 | 8 |
| 1997 | 5 |
| 1998 | 7 |
| 1999 | 5 |
| 2001 | 6 |
| 2005 | 12 |
| 2006 | 5 |
| 2007 | 8 |
| 2008 | 7 |
| 2011 | 14 |
| 2014 | 10 |
| 2018 | 6 |
| 2019 | 6 |