| Year | Count |
|---|---|
| 1911 | 9 |
| 1915 | 9 |
| 1916 | 6 |
| 1917 | 11 |
| 1918 | 11 |
| 1919 | 6 |
| 1921 | 9 |
| 1923 | 18 |
| 1924 | 10 |
| 1925 | 14 |
| 1927 | 16 |
| 1928 | 10 |
| 1929 | 12 |
| 1930 | 20 |
| 1933 | 6 |
| 1935 | 6 |
| 1938 | 6 |
| 1940 | 6 |
| 1942 | 6 |
| 1944 | 9 |
| 1946 | 9 |
| 1948 | 5 |
| 1950 | 5 |
| 1951 | 7 |
| 1952 | 5 |
| 1966 | 7 |
| 1967 | 5 |
| 1969 | 7 |
| 1975 | 5 |
| 1979 | 10 |
| 1986 | 6 |
| 1990 | 5 |
| 1993 | 7 |
| 1995 | 5 |
| 1999 | 6 |
| 2001 | 6 |
| 2002 | 7 |
| 2003 | 7 |
| 2006 | 5 |
| 2007 | 7 |
| 2010 | 5 |
| 2014 | 6 |
| 2017 | 18 |
| 2018 | 12 |