| Year | Count |
|---|---|
| 1911 | 6 |
| 1913 | 11 |
| 1914 | 12 |
| 1915 | 10 |
| 1916 | 17 |
| 1917 | 11 |
| 1918 | 13 |
| 1919 | 14 |
| 1920 | 12 |
| 1921 | 7 |
| 1922 | 6 |
| 1923 | 8 |
| 1924 | 9 |
| 1925 | 12 |
| 1926 | 9 |
| 1927 | 13 |
| 1928 | 13 |
| 1929 | 16 |
| 1930 | 11 |
| 1931 | 13 |
| 1932 | 8 |
| 1933 | 13 |
| 1934 | 13 |
| 1935 | 12 |
| 1936 | 11 |
| 1937 | 12 |
| 1938 | 12 |
| 1939 | 7 |
| 1940 | 12 |
| 1941 | 9 |
| 1942 | 8 |
| 1943 | 6 |
| 1945 | 5 |
| 1947 | 7 |
| 1951 | 5 |
| 1953 | 8 |
| 1955 | 6 |
| 1965 | 5 |
| 1967 | 5 |
| 1983 | 6 |
| 1988 | 7 |