| Year | Count |
|---|---|
| 1918 | 10 |
| 1922 | 5 |
| 1923 | 10 |
| 1924 | 19 |
| 1925 | 18 |
| 1926 | 15 |
| 1927 | 10 |
| 1928 | 24 |
| 1930 | 10 |
| 1932 | 6 |
| 1935 | 7 |
| 1936 | 5 |
| 1938 | 6 |
| 1941 | 5 |
| 1943 | 7 |
| 1944 | 6 |
| 1945 | 6 |
| 1946 | 5 |
| 1947 | 9 |
| 1948 | 8 |
| 1949 | 13 |
| 1950 | 12 |
| 1951 | 9 |
| 1952 | 11 |
| 1953 | 14 |
| 1954 | 20 |
| 1955 | 19 |
| 1956 | 12 |
| 1957 | 18 |
| 1958 | 14 |
| 1959 | 25 |
| 1960 | 28 |
| 1961 | 7 |
| 1962 | 12 |
| 1963 | 11 |
| 1964 | 8 |
| 1965 | 8 |
| 1966 | 7 |
| 1967 | 10 |
| 1968 | 16 |
| 1969 | 8 |
| 1970 | 36 |
| 1971 | 155 |
| 1972 | 86 |
| 1973 | 114 |
| 1974 | 78 |
| 1975 | 113 |
| 1976 | 76 |
| 1977 | 54 |
| 1978 | 34 |
| 1979 | 31 |
| 1980 | 27 |
| 1981 | 19 |
| 1982 | 18 |
| 1983 | 9 |
| 1984 | 10 |
| 1985 | 5 |
| 1987 | 12 |
| 1988 | 6 |
| 1989 | 12 |
| 1992 | 6 |
| 1997 | 10 |