| Year | Count |
|---|---|
| 1928 | 14 |
| 1930 | 12 |
| 1931 | 9 |
| 1932 | 12 |
| 1933 | 16 |
| 1934 | 11 |
| 1935 | 13 |
| 1936 | 16 |
| 1937 | 12 |
| 1938 | 12 |
| 1939 | 13 |
| 1940 | 30 |
| 1941 | 15 |
| 1942 | 31 |
| 1943 | 32 |
| 1944 | 41 |
| 1945 | 38 |
| 1946 | 46 |
| 1947 | 45 |
| 1948 | 38 |
| 1949 | 41 |
| 1950 | 44 |
| 1951 | 31 |
| 1952 | 29 |
| 1953 | 12 |
| 1954 | 20 |
| 1955 | 21 |
| 1956 | 18 |
| 1957 | 26 |
| 1958 | 28 |
| 1959 | 38 |
| 1960 | 32 |
| 1961 | 42 |
| 1963 | 26 |
| 1964 | 12 |
| 1965 | 15 |
| 1966 | 15 |
| 1967 | 19 |
| 1968 | 17 |
| 1969 | 7 |
| 1970 | 18 |
| 1971 | 15 |
| 1973 | 7 |
| 1978 | 14 |
| 1985 | 6 |
| 1987 | 7 |