| Year | Count |
|---|---|
| 1917 | 6 |
| 1921 | 6 |
| 1923 | 9 |
| 1924 | 17 |
| 1925 | 10 |
| 1926 | 13 |
| 1927 | 17 |
| 1928 | 12 |
| 1929 | 17 |
| 1930 | 15 |
| 1931 | 14 |
| 1932 | 67 |
| 1933 | 48 |
| 1934 | 48 |
| 1935 | 54 |
| 1936 | 86 |
| 1937 | 150 |
| 1938 | 243 |
| 1939 | 231 |
| 1940 | 224 |
| 1941 | 256 |
| 1942 | 275 |
| 1943 | 147 |
| 1944 | 75 |
| 1945 | 61 |
| 1946 | 36 |
| 1947 | 81 |
| 1948 | 36 |
| 1949 | 54 |
| 1950 | 10 |
| 1951 | 10 |
| 1955 | 10 |
| 1957 | 8 |
| 1958 | 6 |
| 1963 | 7 |
| 1966 | 5 |