| Year | Count |
|---|---|
| 1918 | 10 |
| 1922 | 11 |
| 1924 | 6 |
| 1925 | 7 |
| 1926 | 15 |
| 1927 | 7 |
| 1928 | 5 |
| 1929 | 6 |
| 1931 | 8 |
| 1932 | 10 |
| 1933 | 6 |
| 1934 | 8 |
| 1936 | 11 |
| 1937 | 5 |
| 1938 | 7 |
| 1939 | 23 |
| 1941 | 18 |
| 1942 | 6 |
| 1943 | 10 |
| 1944 | 19 |
| 1945 | 22 |
| 1946 | 27 |
| 1947 | 31 |
| 1948 | 55 |
| 1949 | 30 |
| 1950 | 54 |
| 1951 | 28 |
| 1952 | 34 |
| 1953 | 27 |
| 1954 | 22 |
| 1955 | 22 |
| 1956 | 47 |
| 1957 | 21 |
| 1958 | 14 |
| 1959 | 27 |
| 1960 | 54 |
| 1961 | 28 |
| 1962 | 6 |
| 1963 | 28 |
| 1964 | 21 |