| Year | Count |
|---|---|
| 1928 | 10 |
| 1929 | 14 |
| 1930 | 10 |
| 1931 | 9 |
| 1932 | 6 |
| 1933 | 7 |
| 1934 | 7 |
| 1935 | 7 |
| 1936 | 10 |
| 1937 | 8 |
| 1938 | 12 |
| 1939 | 10 |
| 1940 | 10 |
| 1941 | 6 |
| 1942 | 7 |
| 1943 | 6 |
| 1944 | 7 |
| 1945 | 6 |
| 1946 | 7 |
| 1948 | 5 |
| 1954 | 6 |
| 1956 | 5 |
| 1957 | 20 |
| 1958 | 20 |
| 1959 | 20 |
| 1961 | 20 |
| 1962 | 6 |
| 1963 | 12 |
| 1964 | 10 |
| 1965 | 6 |
| 1966 | 11 |
| 1967 | 5 |
| 1969 | 5 |