| Year | Count |
|---|---|
| 1919 | 5 |
| 1923 | 6 |
| 1924 | 6 |
| 1926 | 7 |
| 1928 | 6 |
| 1929 | 7 |
| 1930 | 7 |
| 1932 | 5 |
| 1933 | 6 |
| 1934 | 6 |
| 1935 | 7 |
| 1936 | 6 |
| 1937 | 15 |
| 1939 | 11 |
| 1940 | 7 |
| 1941 | 15 |
| 1942 | 17 |
| 1943 | 14 |
| 1944 | 14 |
| 1945 | 11 |
| 1946 | 14 |
| 1947 | 36 |
| 1948 | 24 |
| 1949 | 38 |
| 1950 | 23 |
| 1951 | 35 |
| 1952 | 53 |
| 1953 | 35 |
| 1954 | 35 |
| 1955 | 42 |
| 1956 | 8 |
| 1957 | 7 |
| 1958 | 5 |
| 1958 | 33 |
| 1959 | 30 |
| 1960 | 20 |
| 1961 | 22 |
| 1962 | 20 |
| 1963 | 9 |
| 1964 | 12 |
| 1965 | 8 |
| 1966 | 6 |
| 1967 | 8 |
| 1968 | 7 |
| 1970 | 7 |
| 1971 | 6 |
| 1976 | 8 |
| 1978 | 5 |
| 1982 | 6 |