| Year | Count |
|---|---|
| 1917 | 7 |
| 1918 | 8 |
| 1919 | 6 |
| 1921 | 6 |
| 1922 | 6 |
| 1923 | 7 |
| 1925 | 7 |
| 1927 | 8 |
| 1928 | 7 |
| 1929 | 8 |
| 1932 | 10 |
| 1933 | 8 |
| 1934 | 5 |
| 1935 | 9 |
| 1936 | 9 |
| 1937 | 6 |
| 1938 | 9 |
| 1939 | 9 |
| 1940 | 12 |
| 1941 | 9 |
| 1943 | 11 |
| 1944 | 9 |
| 1945 | 12 |
| 1946 | 5 |
| 1947 | 11 |
| 1948 | 14 |
| 1949 | 10 |
| 1950 | 10 |
| 1951 | 7 |
| 1952 | 11 |
| 1953 | 6 |
| 1954 | 6 |
| 1955 | 7 |
| 1956 | 20 |
| 1957 | 9 |
| 1958 | 5 |
| 1960 | 10 |
| 1962 | 16 |
| 1963 | 14 |
| 1964 | 26 |
| 1965 | 10 |
| 1966 | 12 |
| 1967 | 10 |
| 1969 | 12 |