| Year | Count |
|---|---|
| 1915 | 7 |
| 1916 | 5 |
| 1917 | 6 |
| 1923 | 7 |
| 1924 | 6 |
| 1926 | 7 |
| 1928 | 8 |
| 1929 | 6 |
| 1930 | 7 |
| 1931 | 5 |
| 1932 | 10 |
| 1933 | 8 |
| 1934 | 6 |
| 1935 | 5 |
| 1936 | 7 |
| 1937 | 6 |
| 1938 | 8 |
| 1939 | 5 |
| 1941 | 5 |
| 1943 | 6 |
| 1944 | 6 |
| 1945 | 8 |
| 1946 | 7 |
| 1947 | 7 |
| 1948 | 10 |
| 1949 | 7 |
| 1950 | 5 |
| 1953 | 7 |
| 1954 | 8 |
| 1956 | 6 |
| 1958 | 6 |
| 1959 | 6 |
| 1961 | 7 |
| 1963 | 6 |
| 1964 | 8 |
| 1965 | 9 |
| 1966 | 7 |
| 1969 | 9 |
| 1971 | 5 |