| Year | Count |
|---|---|
| 1910 | 5 |
| 1911 | 6 |
| 1912 | 7 |
| 1913 | 8 |
| 1914 | 10 |
| 1915 | 14 |
| 1916 | 9 |
| 1917 | 16 |
| 1920 | 7 |
| 1921 | 5 |
| 1922 | 14 |
| 1923 | 20 |
| 1924 | 30 |
| 1925 | 38 |
| 1926 | 42 |
| 1927 | 38 |
| 1928 | 66 |
| 1929 | 56 |
| 1930 | 80 |
| 1931 | 21 |
| 1932 | 28 |
| 1933 | 27 |
| 1934 | 19 |
| 1935 | 12 |
| 1936 | 9 |
| 1937 | 13 |
| 1938 | 12 |
| 1939 | 8 |
| 1940 | 15 |
| 1941 | 12 |
| 1942 | 10 |
| 1943 | 6 |
| 1944 | 10 |
| 1945 | 6 |