| Year | Count |
|---|---|
| 1914 | 8 |
| 1919 | 5 |
| 1923 | 7 |
| 1924 | 6 |
| 1925 | 7 |
| 1928 | 9 |
| 1929 | 8 |
| 1930 | 16 |
| 1931 | 10 |
| 1939 | 5 |
| 1940 | 5 |
| 1942 | 8 |
| 1943 | 6 |
| 1945 | 10 |
| 1946 | 10 |
| 1948 | 10 |
| 1949 | 7 |
| 1955 | 15 |
| 1957 | 14 |
| 1960 | 14 |
| 1962 | 14 |
| 1965 | 12 |
| 1968 | 12 |
| 1969 | 5 |
| 1976 | 7 |
| 1978 | 6 |
| 1979 | 7 |
| 1989 | 6 |
| 1990 | 6 |
| 1997 | 5 |
| 1998 | 7 |
| 1999 | 6 |
| 2001 | 7 |
| 2009 | 5 |