| Year | Count |
|---|---|
| 1915 | 7 |
| 1916 | 5 |
| 1917 | 9 |
| 1918 | 6 |
| 1919 | 8 |
| 1920 | 12 |
| 1921 | 9 |
| 1922 | 9 |
| 1923 | 11 |
| 1924 | 20 |
| 1925 | 18 |
| 1926 | 8 |
| 1927 | 13 |
| 1928 | 11 |
| 1929 | 13 |
| 1930 | 51 |
| 1931 | 37 |
| 1932 | 30 |
| 1933 | 23 |
| 1934 | 21 |
| 1935 | 38 |
| 1936 | 14 |
| 1937 | 19 |
| 1938 | 18 |
| 1939 | 17 |
| 1940 | 20 |
| 1941 | 15 |
| 1942 | 13 |
| 1943 | 8 |
| 1944 | 9 |
| 1945 | 9 |
| 1946 | 8 |
| 1947 | 11 |
| 1948 | 8 |
| 1949 | 6 |
| 1950 | 11 |
| 1951 | 20 |
| 1952 | 18 |
| 1953 | 22 |
| 1954 | 17 |
| 1955 | 17 |
| 1956 | 14 |
| 1957 | 6 |
| 1958 | 10 |
| 1959 | 12 |
| 1960 | 29 |
| 1961 | 22 |
| 1963 | 5 |
| 1964 | 7 |
| 1967 | 11 |
| 1968 | 7 |
| 1969 | 7 |
| 1971 | 14 |
| 1972 | 7 |
| 1973 | 11 |
| 1974 | 8 |
| 1975 | 9 |
| 1976 | 7 |
| 1979 | 5 |
| 1980 | 7 |
| 1981 | 8 |
| 1984 | 5 |
| 1996 | 5 |
| 2001 | 6 |