| Year | Count |
|---|---|
| 1917 | 8 |
| 1918 | 8 |
| 1919 | 10 |
| 1920 | 9 |
| 1922 | 7 |
| 1923 | 16 |
| 1924 | 19 |
| 1925 | 12 |
| 1926 | 11 |
| 1927 | 17 |
| 1928 | 13 |
| 1929 | 13 |
| 1930 | 10 |
| 1931 | 9 |
| 1939 | 5 |
| 1940 | 7 |
| 1941 | 7 |
| 1942 | 14 |
| 1943 | 8 |
| 1944 | 10 |
| 1945 | 18 |
| 1946 | 10 |
| 1947 | 33 |
| 1948 | 11 |
| 1949 | 6 |
| 1955 | 27 |
| 1956 | 10 |
| 1957 | 10 |
| 1958 | 18 |
| 1959 | 18 |
| 1960 | 20 |
| 1962 | 12 |
| 1963 | 24 |
| 1964 | 26 |
| 1965 | 10 |
| 1966 | 16 |
| 1967 | 20 |
| 1968 | 16 |
| 1969 | 7 |
| 1970 | 8 |
| 1972 | 6 |
| 1973 | 6 |
| 1974 | 5 |
| 1975 | 8 |
| 1976 | 5 |
| 1977 | 5 |
| 1978 | 5 |
| 1979 | 6 |
| 1981 | 11 |
| 1982 | 11 |
| 1985 | 7 |
| 1986 | 6 |
| 1988 | 8 |
| 1989 | 5 |
| 1990 | 6 |
| 1992 | 6 |
| 1993 | 10 |
| 1995 | 5 |
| 1996 | 5 |
| 1997 | 7 |
| 1999 | 12 |
| 2007 | 7 |