| Year | Count |
|---|---|
| 1915 | 6 |
| 1916 | 5 |
| 1917 | 7 |
| 1918 | 9 |
| 1919 | 7 |
| 1920 | 8 |
| 1921 | 14 |
| 1922 | 10 |
| 1923 | 6 |
| 1924 | 9 |
| 1926 | 5 |
| 1927 | 6 |
| 1928 | 11 |
| 1929 | 5 |
| 1930 | 9 |
| 1931 | 8 |
| 1939 | 6 |
| 1940 | 7 |
| 1942 | 5 |
| 1943 | 10 |
| 1944 | 12 |
| 1945 | 12 |
| 1946 | 13 |
| 1947 | 21 |
| 1948 | 11 |
| 1949 | 15 |
| 1955 | 30 |
| 1956 | 15 |
| 1957 | 19 |
| 1958 | 16 |
| 1960 | 14 |
| 1962 | 16 |
| 1963 | 10 |
| 1964 | 18 |
| 1967 | 18 |
| 1968 | 20 |
| 1969 | 5 |
| 1970 | 9 |
| 1971 | 8 |
| 1972 | 5 |
| 1973 | 8 |
| 1974 | 5 |
| 1975 | 5 |
| 1976 | 8 |
| 1979 | 5 |
| 1980 | 5 |
| 1981 | 7 |
| 1982 | 5 |
| 1985 | 7 |
| 1986 | 7 |
| 1987 | 5 |
| 1990 | 13 |
| 1991 | 8 |
| 1993 | 8 |
| 1994 | 5 |
| 1995 | 6 |
| 1996 | 8 |
| 1997 | 6 |
| 2009 | 8 |