| Year | Count |
|---|---|
| 1914 | 5 |
| 1915 | 7 |
| 1916 | 7 |
| 1918 | 6 |
| 1920 | 6 |
| 1924 | 8 |
| 1925 | 5 |
| 1926 | 9 |
| 1927 | 5 |
| 1928 | 9 |
| 1929 | 7 |
| 1930 | 10 |
| 1938 | 5 |
| 1939 | 6 |
| 1940 | 8 |
| 1942 | 6 |
| 1944 | 9 |
| 1947 | 15 |
| 1948 | 8 |
| 1949 | 7 |
| 1955 | 39 |
| 1956 | 14 |
| 1957 | 16 |
| 1958 | 12 |
| 1959 | 20 |
| 1960 | 10 |
| 1962 | 12 |
| 1963 | 10 |
| 1965 | 16 |
| 1966 | 10 |
| 1969 | 5 |
| 1970 | 5 |
| 1971 | 7 |
| 1972 | 6 |
| 1973 | 6 |
| 1974 | 5 |
| 1976 | 5 |
| 1978 | 5 |
| 1979 | 9 |
| 1980 | 10 |
| 1981 | 10 |
| 1982 | 9 |
| 1983 | 7 |
| 1984 | 8 |
| 1985 | 10 |
| 1986 | 9 |
| 1990 | 5 |
| 1992 | 5 |
| 1994 | 6 |
| 1995 | 7 |
| 1996 | 5 |
| 2000 | 6 |
| 2001 | 7 |
| 2006 | 6 |