| Year | Count |
|---|---|
| 1915 | 5 |
| 1916 | 10 |
| 1917 | 11 |
| 1918 | 10 |
| 1919 | 23 |
| 1920 | 29 |
| 1921 | 16 |
| 1922 | 17 |
| 1923 | 21 |
| 1924 | 26 |
| 1925 | 15 |
| 1926 | 5 |
| 1927 | 8 |
| 1932 | 5 |
| 1936 | 5 |
| 1937 | 5 |
| 1938 | 5 |
| 1939 | 6 |
| 1940 | 5 |
| 1941 | 7 |
| 1942 | 23 |
| 1943 | 20 |
| 1944 | 12 |
| 1945 | 10 |
| 1946 | 17 |
| 1947 | 6 |
| 1948 | 41 |
| 1949 | 79 |
| 1950 | 92 |
| 1951 | 65 |
| 1952 | 123 |
| 1953 | 72 |
| 1954 | 43 |
| 1955 | 43 |
| 1956 | 24 |
| 1957 | 31 |
| 1958 | 55 |
| 1959 | 32 |
| 1960 | 30 |
| 1961 | 43 |
| 1962 | 34 |
| 1963 | 6 |
| 1964 | 5 |
| 1965 | 18 |
| 1966 | 6 |
| 1968 | 22 |
| 1970 | 5 |