| Year | Count |
|---|---|
| 1913 | 7 |
| 1916 | 7 |
| 1918 | 9 |
| 1920 | 11 |
| 1921 | 5 |
| 1922 | 24 |
| 1923 | 20 |
| 1925 | 14 |
| 1926 | 16 |
| 1927 | 14 |
| 1929 | 16 |
| 1930 | 12 |
| 1931 | 5 |
| 1932 | 6 |
| 1933 | 5 |
| 1937 | 5 |
| 1942 | 5 |
| 1943 | 9 |
| 1949 | 8 |
| 1951 | 5 |
| 1952 | 6 |
| 1955 | 8 |
| 1957 | 12 |
| 1959 | 10 |
| 1960 | 16 |
| 1963 | 11 |
| 1964 | 7 |
| 1966 | 6 |
| 1967 | 6 |
| 1968 | 11 |
| 1969 | 35 |
| 1970 | 57 |
| 1971 | 68 |
| 1972 | 60 |
| 1973 | 56 |
| 1974 | 15 |
| 1975 | 45 |
| 1976 | 24 |
| 1977 | 10 |
| 1978 | 5 |
| 1979 | 25 |