| Year | Count |
|---|---|
| 1915 | 29 |
| 1916 | 13 |
| 1917 | 5 |
| 1918 | 19 |
| 1919 | 22 |
| 1920 | 33 |
| 1921 | 24 |
| 1922 | 22 |
| 1923 | 37 |
| 1924 | 30 |
| 1925 | 41 |
| 1926 | 46 |
| 1927 | 24 |
| 1928 | 41 |
| 1929 | 55 |
| 1930 | 41 |
| 1931 | 52 |
| 1932 | 18 |
| 1933 | 38 |
| 1934 | 35 |
| 1935 | 50 |
| 1936 | 36 |
| 1937 | 20 |
| 1938 | 42 |
| 1939 | 56 |
| 1940 | 47 |
| 1941 | 38 |
| 1942 | 41 |
| 1943 | 69 |
| 1944 | 64 |
| 1945 | 30 |
| 1946 | 45 |
| 1947 | 78 |
| 1948 | 30 |
| 1949 | 18 |
| 1950 | 18 |
| 1951 | 22 |
| 1952 | 36 |
| 1953 | 20 |
| 1954 | 26 |
| 1955 | 12 |
| 1956 | 16 |
| 1957 | 25 |
| 1958 | 8 |
| 1959 | 7 |
| 1960 | 10 |
| 1961 | 19 |
| 1962 | 20 |
| 1963 | 9 |
| 1964 | 7 |
| 1965 | 7 |
| 1966 | 18 |
| 1967 | 18 |
| 1969 | 18 |
| 1970 | 12 |
| 1972 | 12 |