| Year | Count |
|---|---|
| 1915 | 12 |
| 1918 | 15 |
| 1920 | 14 |
| 1921 | 34 |
| 1922 | 15 |
| 1924 | 16 |
| 1926 | 5 |
| 1928 | 15 |
| 1930 | 20 |
| 1932 | 11 |
| 1934 | 6 |
| 1935 | 15 |
| 1936 | 7 |
| 1937 | 11 |
| 1938 | 17 |
| 1939 | 5 |
| 1940 | 16 |
| 1941 | 12 |
| 1942 | 13 |
| 1943 | 33 |
| 1944 | 29 |
| 1945 | 6 |
| 1946 | 5 |
| 1947 | 42 |
| 1948 | 6 |
| 1949 | 17 |
| 1950 | 24 |
| 1951 | 44 |
| 1952 | 29 |
| 1953 | 37 |
| 1954 | 23 |
| 1955 | 11 |
| 1956 | 30 |
| 1957 | 16 |