| Year | Count |
|---|---|
| 1926 | 18 |
| 1928 | 6 |
| 1929 | 6 |
| 1930 | 12 |
| 1931 | 5 |
| 1933 | 7 |
| 1935 | 10 |
| 1936 | 28 |
| 1937 | 28 |
| 1938 | 22 |
| 1939 | 10 |
| 1940 | 24 |
| 1942 | 16 |
| 1943 | 5 |
| 1944 | 5 |
| 1946 | 21 |
| 1947 | 54 |
| 1948 | 5 |
| 1949 | 25 |
| 1950 | 29 |
| 1951 | 51 |
| 1952 | 7 |
| 1953 | 16 |
| 1954 | 16 |
| 1955 | 18 |
| 1956 | 20 |
| 1957 | 10 |
| 1958 | 5 |
| 1960 | 28 |
| 1963 | 5 |
| 1965 | 11 |
| 1966 | 17 |
| 1968 | 31 |
| 1969 | 18 |
| 1970 | 5 |
| 1971 | 5 |