| Year | Count |
|---|---|
| 1918 | 9 |
| 1920 | 7 |
| 1921 | 10 |
| 1922 | 19 |
| 1923 | 16 |
| 1925 | 5 |
| 1927 | 5 |
| 1928 | 25 |
| 1929 | 12 |
| 1931 | 7 |
| 1932 | 5 |
| 1933 | 5 |
| 1934 | 5 |
| 1938 | 10 |
| 1939 | 34 |
| 1941 | 11 |
| 1942 | 15 |
| 1943 | 10 |
| 1944 | 10 |
| 1946 | 10 |
| 1947 | 5 |
| 1948 | 20 |
| 1949 | 5 |
| 1950 | 33 |
| 1951 | 70 |
| 1952 | 46 |
| 1953 | 62 |
| 1954 | 113 |
| 1955 | 85 |
| 1956 | 88 |
| 1957 | 83 |
| 1958 | 79 |
| 1959 | 89 |
| 1960 | 109 |
| 1961 | 116 |
| 1962 | 80 |
| 1963 | 67 |
| 1964 | 55 |
| 1965 | 66 |
| 1966 | 57 |
| 1967 | 71 |
| 1968 | 57 |
| 1969 | 45 |
| 1970 | 39 |
| 1971 | 30 |
| 1972 | 27 |
| 1973 | 34 |
| 1974 | 5 |
| 1975 | 16 |
| 1977 | 12 |
| 1979 | 14 |
| 1980 | 12 |
| 1983 | 10 |