| Year | Count |
|---|---|
| 1913 | 6 |
| 1914 | 12 |
| 1915 | 10 |
| 1916 | 21 |
| 1918 | 10 |
| 1919 | 9 |
| 1920 | 19 |
| 1922 | 10 |
| 1923 | 10 |
| 1924 | 8 |
| 1925 | 7 |
| 1926 | 13 |
| 1927 | 22 |
| 1928 | 18 |
| 1929 | 24 |
| 1930 | 35 |
| 1931 | 8 |
| 1933 | 12 |
| 1934 | 14 |
| 1935 | 30 |
| 1936 | 9 |
| 1937 | 6 |
| 1938 | 10 |
| 1940 | 8 |
| 1941 | 6 |
| 1943 | 18 |
| 1947 | 8 |
| 1950 | 24 |
| 1951 | 19 |
| 1952 | 7 |
| 1953 | 15 |
| 1954 | 18 |
| 1955 | 14 |
| 1956 | 21 |
| 1957 | 21 |
| 1958 | 23 |
| 1959 | 27 |
| 1960 | 28 |
| 1961 | 32 |
| 1962 | 9 |
| 1963 | 16 |
| 1964 | 13 |
| 1965 | 10 |
| 1966 | 10 |
| 1967 | 17 |
| 1968 | 13 |
| 1969 | 26 |
| 1970 | 17 |
| 1971 | 10 |
| 1972 | 15 |
| 1973 | 14 |
| 1974 | 10 |
| 1975 | 23 |
| 1976 | 8 |
| 1977 | 31 |
| 1978 | 17 |
| 1979 | 22 |
| 1983 | 5 |
| 1984 | 7 |
| 1985 | 5 |
| 1986 | 5 |
| 1987 | 16 |
| 1988 | 7 |