| Year | Count |
|---|---|
| 1917 | 6 |
| 1921 | 6 |
| 1923 | 9 |
| 1924 | 7 |
| 1925 | 10 |
| 1926 | 5 |
| 1927 | 5 |
| 1928 | 12 |
| 1929 | 11 |
| 1930 | 10 |
| 1931 | 14 |
| 1932 | 30 |
| 1933 | 28 |
| 1934 | 25 |
| 1935 | 31 |
| 1936 | 25 |
| 1937 | 56 |
| 1938 | 70 |
| 1939 | 58 |
| 1940 | 70 |
| 1941 | 85 |
| 1942 | 72 |
| 1943 | 54 |
| 1944 | 23 |
| 1945 | 24 |
| 1946 | 19 |
| 1947 | 31 |
| 1948 | 25 |
| 1949 | 18 |
| 1950 | 10 |
| 1951 | 10 |
| 1955 | 5 |
| 1957 | 8 |
| 1958 | 6 |
| 1963 | 7 |