| Year | Count |
|---|---|
| 1927 | 10 |
| 1928 | 10 |
| 1929 | 18 |
| 1931 | 5 |
| 1933 | 6 |
| 1936 | 9 |
| 1937 | 6 |
| 1940 | 8 |
| 1941 | 5 |
| 1942 | 7 |
| 1943 | 8 |
| 1944 | 7 |
| 1946 | 7 |
| 1947 | 15 |
| 1948 | 9 |
| 1949 | 9 |
| 1950 | 7 |
| 1952 | 11 |
| 1953 | 5 |
| 1954 | 13 |
| 1955 | 14 |
| 1956 | 11 |
| 1957 | 22 |
| 1958 | 24 |
| 1959 | 22 |
| 1960 | 24 |
| 1961 | 24 |
| 1963 | 8 |
| 1964 | 8 |
| 1965 | 11 |
| 1966 | 6 |
| 1967 | 8 |
| 1972 | 6 |
| 1985 | 7 |
| 1986 | 6 |
| 1987 | 6 |