| Year | Count |
|---|---|
| 1916 | 10 |
| 1917 | 10 |
| 1918 | 22 |
| 1921 | 23 |
| 1923 | 5 |
| 1924 | 32 |
| 1925 | 29 |
| 1926 | 69 |
| 1927 | 60 |
| 1928 | 139 |
| 1929 | 159 |
| 1930 | 146 |
| 1931 | 177 |
| 1932 | 217 |
| 1933 | 247 |
| 1934 | 254 |
| 1935 | 290 |
| 1936 | 218 |
| 1937 | 229 |
| 1938 | 251 |
| 1939 | 267 |
| 1940 | 289 |
| 1941 | 249 |
| 1942 | 182 |
| 1943 | 186 |
| 1944 | 192 |
| 1945 | 165 |
| 1946 | 172 |
| 1947 | 222 |
| 1948 | 236 |
| 1949 | 250 |
| 1950 | 182 |
| 1951 | 214 |
| 1952 | 194 |
| 1953 | 171 |
| 1954 | 197 |
| 1955 | 148 |
| 1956 | 150 |
| 1957 | 94 |
| 1958 | 197 |
| 1959 | 101 |
| 1960 | 75 |
| 1961 | 29 |
| 1962 | 23 |
| 1965 | 6 |
| 1967 | 7 |
| 1970 | 6 |