| Year | Count |
|---|---|
| 1918 | 23 |
| 1919 | 5 |
| 1920 | 8 |
| 1921 | 21 |
| 1922 | 8 |
| 1923 | 22 |
| 1924 | 20 |
| 1925 | 45 |
| 1926 | 53 |
| 1927 | 111 |
| 1928 | 126 |
| 1929 | 158 |
| 1930 | 168 |
| 1931 | 192 |
| 1932 | 139 |
| 1933 | 180 |
| 1934 | 128 |
| 1935 | 130 |
| 1936 | 97 |
| 1937 | 86 |
| 1938 | 69 |
| 1939 | 76 |
| 1940 | 44 |
| 1941 | 69 |
| 1942 | 52 |
| 1943 | 84 |
| 1944 | 26 |
| 1945 | 31 |
| 1946 | 12 |
| 1947 | 28 |
| 1948 | 34 |
| 1949 | 19 |
| 1950 | 20 |
| 1951 | 31 |
| 1952 | 24 |
| 1953 | 14 |
| 1954 | 9 |
| 1955 | 13 |
| 1956 | 7 |
| 1957 | 5 |
| 1958 | 5 |
| 1975 | 6 |
| 1982 | 5 |