| Year | Count |
|---|---|
| 1921 | 5 |
| 1922 | 12 |
| 1926 | 16 |
| 1927 | 16 |
| 1928 | 24 |
| 1930 | 18 |
| 1931 | 5 |
| 1933 | 6 |
| 1937 | 10 |
| 1941 | 5 |
| 1942 | 6 |
| 1943 | 8 |
| 1944 | 5 |
| 1946 | 7 |
| 1947 | 8 |
| 1948 | 9 |
| 1950 | 12 |
| 1951 | 18 |
| 1952 | 8 |
| 1953 | 18 |
| 1954 | 17 |
| 1955 | 18 |
| 1956 | 35 |
| 1957 | 38 |
| 1958 | 38 |
| 1959 | 50 |
| 1960 | 42 |
| 1961 | 48 |
| 1963 | 14 |
| 1964 | 21 |
| 1965 | 20 |
| 1966 | 18 |
| 1967 | 9 |
| 1968 | 11 |
| 1969 | 6 |
| 1970 | 15 |
| 1971 | 11 |
| 1972 | 8 |
| 1973 | 7 |
| 1974 | 5 |
| 1979 | 18 |
| 1982 | 5 |
| 1984 | 6 |
| 1986 | 5 |
| 1987 | 5 |