| Year | Count |
|---|---|
| 1910 | 40 |
| 1911 | 44 |
| 1912 | 116 |
| 1913 | 166 |
| 1914 | 205 |
| 1915 | 260 |
| 1916 | 299 |
| 1917 | 354 |
| 1918 | 432 |
| 1919 | 381 |
| 1920 | 444 |
| 1921 | 465 |
| 1922 | 460 |
| 1923 | 473 |
| 1924 | 453 |
| 1925 | 394 |
| 1926 | 458 |
| 1927 | 416 |
| 1928 | 352 |
| 1929 | 364 |
| 1930 | 339 |
| 1931 | 392 |
| 1932 | 407 |
| 1933 | 356 |
| 1934 | 301 |
| 1935 | 311 |
| 1936 | 268 |
| 1937 | 222 |
| 1938 | 187 |
| 1939 | 125 |
| 1940 | 93 |
| 1941 | 88 |
| 1942 | 97 |
| 1943 | 92 |
| 1944 | 59 |
| 1945 | 42 |
| 1946 | 50 |
| 1947 | 60 |
| 1948 | 28 |
| 1949 | 28 |
| 1950 | 14 |
| 1951 | 26 |
| 1952 | 19 |
| 1953 | 17 |
| 1954 | 20 |
| 1956 | 5 |
| 1957 | 6 |
| 1958 | 13 |
| 1959 | 10 |
| 1962 | 11 |
| 1964 | 5 |
| 1966 | 10 |