| Year | Count |
|---|---|
| 1928 | 20 |
| 1931 | 5 |
| 1932 | 10 |
| 1933 | 20 |
| 1934 | 20 |
| 1935 | 5 |
| 1937 | 25 |
| 1938 | 15 |
| 1939 | 9 |
| 1940 | 24 |
| 1941 | 18 |
| 1942 | 30 |
| 1943 | 21 |
| 1944 | 19 |
| 1945 | 17 |
| 1946 | 35 |
| 1947 | 38 |
| 1948 | 58 |
| 1949 | 54 |
| 1950 | 43 |
| 1951 | 56 |
| 1952 | 61 |
| 1953 | 92 |
| 1954 | 44 |
| 1955 | 70 |
| 1956 | 42 |
| 1957 | 48 |
| 1958 | 44 |
| 1959 | 43 |
| 1960 | 35 |
| 1961 | 19 |
| 1962 | 10 |
| 1963 | 19 |
| 1964 | 9 |
| 1965 | 7 |
| 1967 | 11 |
| 1971 | 5 |