| Year | Count |
|---|---|
| 1924 | 6 |
| 1927 | 5 |
| 1929 | 16 |
| 1931 | 28 |
| 1932 | 12 |
| 1933 | 33 |
| 1934 | 6 |
| 1935 | 37 |
| 1936 | 31 |
| 1937 | 30 |
| 1938 | 42 |
| 1939 | 79 |
| 1940 | 60 |
| 1941 | 43 |
| 1942 | 28 |
| 1943 | 38 |
| 1944 | 41 |
| 1945 | 33 |
| 1946 | 40 |
| 1947 | 67 |
| 1948 | 137 |
| 1949 | 153 |
| 1950 | 173 |
| 1951 | 190 |
| 1952 | 159 |
| 1953 | 192 |
| 1954 | 97 |
| 1955 | 133 |
| 1956 | 96 |
| 1957 | 158 |
| 1958 | 89 |
| 1959 | 106 |
| 1960 | 86 |
| 1961 | 94 |
| 1962 | 86 |
| 1963 | 50 |
| 1964 | 85 |
| 1965 | 162 |
| 1966 | 317 |
| 1967 | 241 |
| 1968 | 141 |
| 1969 | 151 |
| 1970 | 148 |
| 1971 | 131 |
| 1972 | 79 |
| 1973 | 54 |
| 1974 | 59 |
| 1975 | 59 |
| 1976 | 31 |
| 1977 | 67 |
| 1978 | 36 |
| 1979 | 29 |
| 1980 | 45 |
| 1981 | 26 |
| 1982 | 31 |
| 1983 | 17 |
| 1984 | 6 |