| Year | Count |
|---|---|
| 1915 | 19 |
| 1916 | 18 |
| 1917 | 10 |
| 1918 | 11 |
| 1919 | 32 |
| 1920 | 9 |
| 1921 | 34 |
| 1922 | 42 |
| 1923 | 84 |
| 1924 | 112 |
| 1925 | 77 |
| 1926 | 113 |
| 1927 | 89 |
| 1928 | 124 |
| 1929 | 162 |
| 1930 | 178 |
| 1931 | 87 |
| 1932 | 118 |
| 1933 | 105 |
| 1934 | 139 |
| 1935 | 163 |
| 1936 | 156 |
| 1937 | 113 |
| 1938 | 143 |
| 1939 | 92 |
| 1940 | 135 |
| 1941 | 135 |
| 1942 | 161 |
| 1943 | 96 |
| 1944 | 88 |
| 1945 | 121 |
| 1946 | 125 |
| 1947 | 179 |
| 1948 | 120 |
| 1949 | 141 |
| 1950 | 135 |
| 1951 | 109 |
| 1952 | 119 |
| 1953 | 91 |
| 1954 | 115 |
| 1955 | 94 |
| 1956 | 172 |
| 1957 | 136 |
| 1958 | 126 |
| 1959 | 127 |
| 1960 | 89 |
| 1961 | 100 |
| 1962 | 20 |
| 1963 | 36 |
| 1964 | 32 |
| 1965 | 39 |
| 1966 | 26 |
| 1967 | 20 |
| 1968 | 24 |
| 1969 | 5 |