| Year | Count |
|---|---|
| 1914 | 5 |
| 1920 | 7 |
| 1924 | 10 |
| 1926 | 14 |
| 1929 | 14 |
| 1930 | 16 |
| 1932 | 11 |
| 1934 | 6 |
| 1936 | 6 |
| 1939 | 7 |
| 1942 | 7 |
| 1947 | 7 |
| 1948 | 5 |
| 1949 | 5 |
| 1951 | 7 |
| 1953 | 7 |
| 1954 | 9 |
| 1955 | 10 |
| 1958 | 14 |
| 1959 | 16 |
| 1960 | 10 |
| 1961 | 18 |
| 1963 | 28 |
| 1964 | 12 |
| 1965 | 14 |
| 1966 | 42 |
| 1967 | 26 |
| 1968 | 22 |
| 1969 | 13 |
| 1970 | 19 |
| 1971 | 12 |
| 1972 | 8 |
| 1973 | 8 |
| 1974 | 8 |
| 1976 | 9 |
| 1978 | 18 |
| 1979 | 10 |
| 1982 | 5 |
| 1983 | 5 |