| Year | Count |
|---|---|
| 1916 | 5 |
| 1918 | 5 |
| 1919 | 5 |
| 1923 | 22 |
| 1924 | 28 |
| 1925 | 15 |
| 1926 | 5 |
| 1927 | 7 |
| 1928 | 10 |
| 1930 | 15 |
| 1931 | 8 |
| 1932 | 23 |
| 1933 | 5 |
| 1934 | 15 |
| 1935 | 31 |
| 1936 | 5 |
| 1937 | 5 |
| 1938 | 10 |
| 1939 | 5 |
| 1940 | 31 |
| 1942 | 10 |
| 1943 | 21 |
| 1945 | 6 |
| 1946 | 6 |
| 1947 | 26 |
| 1948 | 8 |
| 1949 | 15 |
| 1950 | 6 |
| 1951 | 8 |
| 1952 | 25 |
| 1953 | 7 |
| 1955 | 15 |
| 1956 | 13 |
| 1959 | 8 |
| 1960 | 6 |
| 1962 | 10 |
| 1963 | 6 |
| 1964 | 5 |
| 1965 | 6 |
| 1966 | 7 |
| 1968 | 5 |