| Year | Count |
|---|---|
| 1926 | 5 |
| 1928 | 12 |
| 1930 | 20 |
| 1932 | 7 |
| 1933 | 16 |
| 1934 | 10 |
| 1935 | 20 |
| 1936 | 38 |
| 1937 | 12 |
| 1938 | 22 |
| 1939 | 13 |
| 1940 | 6 |
| 1941 | 15 |
| 1942 | 23 |
| 1943 | 16 |
| 1944 | 13 |
| 1945 | 10 |
| 1946 | 24 |
| 1947 | 23 |
| 1948 | 53 |
| 1949 | 18 |
| 1950 | 38 |
| 1951 | 50 |
| 1952 | 23 |
| 1953 | 83 |
| 1954 | 62 |
| 1955 | 32 |
| 1956 | 61 |
| 1957 | 70 |
| 1958 | 36 |
| 1959 | 46 |
| 1960 | 50 |
| 1961 | 61 |
| 1962 | 34 |
| 1963 | 20 |
| 1964 | 29 |
| 1965 | 13 |
| 1966 | 52 |
| 1967 | 53 |
| 1968 | 20 |
| 1969 | 20 |
| 1970 | 37 |
| 1971 | 43 |
| 1972 | 29 |
| 1973 | 16 |
| 1974 | 12 |
| 1975 | 11 |
| 1976 | 25 |
| 1977 | 23 |
| 1978 | 37 |
| 1979 | 14 |
| 1980 | 10 |
| 1982 | 7 |
| 1984 | 14 |
| 1985 | 14 |
| 1986 | 10 |
| 1987 | 18 |