| Year | Count |
|---|---|
| 1917 | 6 |
| 1918 | 10 |
| 1919 | 11 |
| 1920 | 13 |
| 1921 | 12 |
| 1922 | 6 |
| 1923 | 17 |
| 1924 | 13 |
| 1926 | 8 |
| 1927 | 14 |
| 1928 | 14 |
| 1929 | 17 |
| 1930 | 13 |
| 1931 | 24 |
| 1939 | 11 |
| 1940 | 10 |
| 1941 | 6 |
| 1942 | 12 |
| 1943 | 19 |
| 1944 | 9 |
| 1945 | 6 |
| 1946 | 23 |
| 1947 | 33 |
| 1948 | 9 |
| 1949 | 17 |
| 1954 | 6 |
| 1955 | 42 |
| 1956 | 22 |
| 1957 | 22 |
| 1958 | 21 |
| 1959 | 22 |
| 1960 | 28 |
| 1962 | 22 |
| 1963 | 14 |
| 1964 | 16 |
| 1965 | 18 |
| 1966 | 12 |
| 1967 | 12 |
| 1968 | 10 |
| 1969 | 6 |
| 1970 | 14 |
| 1971 | 6 |
| 1972 | 10 |
| 1973 | 9 |
| 1974 | 8 |
| 1975 | 11 |
| 1976 | 6 |
| 1977 | 9 |
| 1979 | 9 |
| 1980 | 12 |
| 1981 | 25 |
| 1983 | 7 |
| 1985 | 6 |
| 1986 | 6 |
| 1987 | 5 |
| 1988 | 6 |
| 1989 | 5 |
| 1990 | 5 |
| 1993 | 6 |
| 1994 | 5 |
| 1996 | 6 |
| 1998 | 6 |
| 1999 | 5 |