| Year | Count |
|---|---|
| 1926 | 12 |
| 1927 | 5 |
| 1928 | 7 |
| 1929 | 5 |
| 1930 | 6 |
| 1932 | 5 |
| 1933 | 12 |
| 1934 | 7 |
| 1936 | 5 |
| 1937 | 6 |
| 1938 | 9 |
| 1943 | 5 |
| 1944 | 8 |
| 1945 | 5 |
| 1946 | 6 |
| 1947 | 11 |
| 1948 | 10 |
| 1949 | 12 |
| 1950 | 21 |
| 1951 | 11 |
| 1952 | 10 |
| 1953 | 7 |
| 1954 | 7 |
| 1955 | 7 |
| 1958 | 6 |
| 1959 | 9 |
| 1960 | 8 |
| 1962 | 8 |
| 1963 | 6 |
| 1964 | 7 |
| 1967 | 6 |
| 1968 | 7 |
| 1969 | 9 |
| 1970 | 6 |
| 1972 | 6 |
| 1973 | 6 |