| Year | Count |
|---|---|
| 1915 | 15 |
| 1917 | 17 |
| 1918 | 7 |
| 1921 | 10 |
| 1923 | 7 |
| 1925 | 6 |
| 1926 | 14 |
| 1927 | 13 |
| 1928 | 13 |
| 1930 | 11 |
| 1935 | 6 |
| 1936 | 8 |
| 1937 | 7 |
| 1938 | 7 |
| 1939 | 5 |
| 1940 | 6 |
| 1942 | 5 |
| 1943 | 7 |
| 1948 | 8 |
| 1949 | 10 |
| 1950 | 10 |
| 1951 | 10 |
| 1952 | 6 |
| 1955 | 5 |
| 1957 | 5 |
| 1959 | 5 |
| 1961 | 32 |
| 1962 | 131 |
| 1963 | 124 |
| 1964 | 125 |
| 1965 | 143 |
| 1966 | 100 |
| 1967 | 101 |
| 1968 | 74 |
| 1969 | 67 |
| 1970 | 61 |
| 1971 | 49 |
| 1972 | 16 |
| 1973 | 12 |
| 1974 | 13 |
| 1975 | 11 |
| 1976 | 20 |
| 1978 | 6 |
| 1979 | 10 |
| 1981 | 5 |
| 1982 | 6 |
| 1983 | 11 |
| 1984 | 6 |
| 1985 | 12 |
| 1987 | 7 |
| 1988 | 10 |
| 1991 | 5 |