| Year | Count |
|---|---|
| 1918 | 6 |
| 1924 | 10 |
| 1928 | 18 |
| 1929 | 10 |
| 1932 | 6 |
| 1933 | 8 |
| 1935 | 6 |
| 1936 | 11 |
| 1937 | 11 |
| 1938 | 11 |
| 1939 | 8 |
| 1940 | 15 |
| 1941 | 14 |
| 1942 | 16 |
| 1943 | 16 |
| 1944 | 15 |
| 1945 | 20 |
| 1946 | 30 |
| 1947 | 29 |
| 1948 | 34 |
| 1949 | 22 |
| 1950 | 28 |
| 1951 | 23 |
| 1952 | 17 |
| 1953 | 32 |
| 1954 | 31 |
| 1955 | 22 |
| 1956 | 26 |
| 1957 | 102 |
| 1958 | 66 |
| 1959 | 66 |
| 1960 | 72 |
| 1961 | 60 |
| 1963 | 32 |
| 1964 | 23 |
| 1965 | 26 |
| 1966 | 14 |
| 1967 | 19 |
| 1968 | 13 |
| 1969 | 11 |
| 1970 | 9 |
| 1971 | 9 |
| 1972 | 6 |
| 1974 | 5 |
| 1975 | 12 |
| 1976 | 12 |
| 1981 | 6 |
| 1991 | 5 |