| Year | Count |
|---|---|
| 1915 | 5 |
| 1916 | 5 |
| 1917 | 6 |
| 1918 | 18 |
| 1919 | 6 |
| 1920 | 23 |
| 1922 | 22 |
| 1923 | 30 |
| 1924 | 49 |
| 1925 | 10 |
| 1926 | 10 |
| 1927 | 10 |
| 1928 | 15 |
| 1929 | 10 |
| 1930 | 72 |
| 1931 | 12 |
| 1932 | 15 |
| 1933 | 24 |
| 1934 | 11 |
| 1935 | 12 |
| 1936 | 28 |
| 1937 | 34 |
| 1938 | 12 |
| 1939 | 17 |
| 1940 | 25 |
| 1941 | 12 |
| 1942 | 56 |
| 1943 | 50 |
| 1944 | 53 |
| 1945 | 8 |
| 1946 | 53 |
| 1947 | 41 |
| 1948 | 54 |
| 1949 | 46 |
| 1950 | 26 |
| 1951 | 21 |
| 1952 | 32 |
| 1953 | 12 |
| 1954 | 17 |
| 1955 | 14 |
| 1956 | 12 |
| 1957 | 23 |
| 1958 | 38 |
| 1960 | 33 |
| 1964 | 6 |