| Year | Count |
|---|---|
| 1910 | 6 |
| 1911 | 8 |
| 1912 | 15 |
| 1914 | 56 |
| 1915 | 63 |
| 1916 | 46 |
| 1917 | 63 |
| 1918 | 65 |
| 1919 | 53 |
| 1920 | 24 |
| 1921 | 59 |
| 1922 | 70 |
| 1923 | 91 |
| 1924 | 75 |
| 1925 | 118 |
| 1926 | 100 |
| 1927 | 104 |
| 1928 | 84 |
| 1929 | 59 |
| 1930 | 69 |
| 1931 | 51 |
| 1932 | 43 |
| 1933 | 26 |
| 1934 | 23 |
| 1935 | 42 |
| 1936 | 26 |
| 1937 | 9 |
| 1938 | 21 |
| 1939 | 27 |
| 1940 | 30 |
| 1941 | 14 |
| 1942 | 23 |
| 1943 | 28 |
| 1944 | 19 |
| 1945 | 17 |
| 1946 | 17 |
| 1947 | 23 |
| 1948 | 29 |
| 1949 | 38 |
| 1950 | 24 |
| 1951 | 13 |
| 1952 | 9 |
| 1953 | 13 |
| 1954 | 21 |
| 1955 | 15 |
| 1956 | 15 |
| 1957 | 37 |
| 1959 | 35 |
| 1960 | 16 |
| 1963 | 8 |
| 1964 | 5 |
| 1965 | 12 |
| 1966 | 6 |
| 1967 | 11 |
| 1968 | 5 |