| Year | Count |
|---|---|
| 1920 | 5 |
| 1926 | 6 |
| 1930 | 10 |
| 1934 | 5 |
| 1936 | 6 |
| 1937 | 5 |
| 1939 | 6 |
| 1941 | 6 |
| 1946 | 12 |
| 1947 | 10 |
| 1948 | 48 |
| 1949 | 89 |
| 1950 | 65 |
| 1951 | 81 |
| 1952 | 72 |
| 1953 | 37 |
| 1954 | 46 |
| 1955 | 85 |
| 1956 | 98 |
| 1957 | 40 |
| 1958 | 25 |
| 1959 | 25 |
| 1960 | 12 |
| 1961 | 20 |
| 1962 | 44 |
| 1963 | 20 |
| 1964 | 12 |
| 1966 | 45 |
| 1967 | 18 |
| 1968 | 6 |
| 1969 | 5 |
| 1970 | 7 |
| 1971 | 7 |
| 1972 | 7 |
| 1973 | 5 |
| 1973 | 5 |
| 1975 | 5 |
| 1976 | 5 |
| 1977 | 6 |
| 1980 | 5 |
| 1984 | 5 |