| Year | Count |
|---|---|
| 1918 | 6 |
| 1919 | 11 |
| 1920 | 8 |
| 1921 | 20 |
| 1922 | 7 |
| 1923 | 9 |
| 1924 | 10 |
| 1925 | 10 |
| 1926 | 12 |
| 1927 | 13 |
| 1928 | 14 |
| 1929 | 8 |
| 1930 | 9 |
| 1931 | 8 |
| 1933 | 8 |
| 1934 | 6 |
| 1935 | 11 |
| 1936 | 8 |
| 1937 | 6 |
| 1938 | 5 |
| 1939 | 9 |
| 1940 | 5 |
| 1941 | 6 |
| 1942 | 6 |
| 1944 | 8 |
| 1945 | 9 |
| 1946 | 11 |
| 1947 | 7 |
| 1948 | 8 |
| 1949 | 11 |
| 1950 | 9 |
| 1951 | 7 |
| 1952 | 12 |
| 1953 | 13 |
| 1954 | 6 |
| 1955 | 11 |
| 1956 | 7 |
| 1957 | 6 |
| 1958 | 9 |
| 1959 | 8 |
| 1960 | 6 |
| 1961 | 8 |
| 1962 | 7 |
| 1963 | 6 |
| 1964 | 8 |
| 1967 | 6 |
| 1970 | 8 |
| 1976 | 6 |
| 1985 | 5 |