| Year | Count |
|---|---|
| 1915 | 114 |
| 1916 | 379 |
| 1917 | 403 |
| 1918 | 400 |
| 1919 | 409 |
| 1920 | 328 |
| 1921 | 271 |
| 1922 | 192 |
| 1923 | 225 |
| 1924 | 186 |
| 1925 | 149 |
| 1926 | 183 |
| 1927 | 146 |
| 1928 | 111 |
| 1929 | 130 |
| 1930 | 67 |
| 1931 | 78 |
| 1932 | 71 |
| 1933 | 32 |
| 1934 | 49 |
| 1935 | 24 |
| 1936 | 43 |
| 1937 | 43 |
| 1938 | 26 |
| 1939 | 35 |
| 1940 | 39 |
| 1941 | 33 |
| 1942 | 23 |
| 1943 | 17 |
| 1944 | 37 |
| 1945 | 22 |
| 1946 | 6 |
| 1947 | 34 |
| 1948 | 38 |
| 1949 | 15 |
| 1950 | 29 |
| 1951 | 12 |
| 1952 | 5 |
| 1953 | 30 |
| 1954 | 13 |
| 1955 | 16 |
| 1956 | 14 |
| 1957 | 5 |
| 1961 | 7 |
| 1964 | 5 |