| Year | Count |
|---|---|
| 1915 | 15 |
| 1918 | 21 |
| 1919 | 18 |
| 1920 | 21 |
| 1924 | 5 |
| 1925 | 6 |
| 1926 | 6 |
| 1927 | 6 |
| 1928 | 5 |
| 1929 | 5 |
| 1930 | 11 |
| 1931 | 6 |
| 1933 | 11 |
| 1934 | 5 |
| 1935 | 10 |
| 1936 | 18 |
| 1937 | 12 |
| 1939 | 22 |
| 1940 | 7 |
| 1941 | 22 |
| 1942 | 32 |
| 1943 | 14 |
| 1944 | 31 |
| 1945 | 21 |
| 1946 | 24 |
| 1947 | 22 |
| 1948 | 21 |
| 1949 | 5 |
| 1950 | 25 |
| 1951 | 10 |
| 1952 | 14 |
| 1957 | 12 |