| Year | Count |
|---|---|
| 1914 | 5 |
| 1915 | 8 |
| 1916 | 5 |
| 1917 | 13 |
| 1918 | 6 |
| 1920 | 10 |
| 1922 | 14 |
| 1923 | 11 |
| 1924 | 7 |
| 1925 | 5 |
| 1926 | 14 |
| 1927 | 12 |
| 1928 | 16 |
| 1929 | 17 |
| 1930 | 16 |
| 1931 | 8 |
| 1934 | 7 |
| 1938 | 6 |
| 1939 | 7 |
| 1940 | 6 |
| 1941 | 10 |
| 1943 | 14 |
| 1945 | 12 |
| 1946 | 8 |
| 1947 | 32 |
| 1948 | 11 |
| 1949 | 11 |
| 1950 | 8 |
| 1952 | 5 |
| 1954 | 18 |
| 1955 | 18 |
| 1956 | 16 |
| 1957 | 10 |
| 1958 | 16 |
| 1959 | 22 |
| 1960 | 23 |
| 1961 | 5 |
| 1962 | 16 |
| 1963 | 16 |
| 1964 | 12 |
| 1970 | 7 |
| 1971 | 8 |
| 1972 | 8 |
| 1973 | 5 |
| 1975 | 8 |
| 1976 | 6 |
| 1978 | 5 |
| 1980 | 10 |
| 1981 | 7 |
| 1982 | 6 |
| 1987 | 7 |
| 1988 | 9 |
| 1990 | 5 |
| 1995 | 5 |
| 1997 | 7 |
| 1998 | 7 |
| 1999 | 6 |
| 2007 | 5 |