| Year | Count |
|---|---|
| 1932 | 10 |
| 1933 | 10 |
| 1934 | 10 |
| 1935 | 12 |
| 1936 | 10 |
| 1940 | 21 |
| 1941 | 5 |
| 1943 | 12 |
| 1946 | 45 |
| 1947 | 46 |
| 1948 | 33 |
| 1949 | 78 |
| 1950 | 97 |
| 1951 | 150 |
| 1952 | 162 |
| 1953 | 208 |
| 1954 | 153 |
| 1955 | 183 |
| 1956 | 176 |
| 1957 | 159 |
| 1958 | 150 |
| 1959 | 156 |
| 1960 | 142 |
| 1961 | 168 |
| 1962 | 219 |
| 1963 | 130 |
| 1964 | 109 |
| 1965 | 117 |
| 1966 | 79 |
| 1967 | 81 |
| 1968 | 92 |
| 1969 | 65 |
| 1970 | 81 |
| 1971 | 89 |
| 1972 | 45 |
| 1973 | 54 |
| 1974 | 44 |
| 1975 | 51 |
| 1976 | 17 |
| 1977 | 23 |
| 1978 | 44 |
| 1979 | 17 |
| 1980 | 33 |
| 1981 | 18 |
| 1983 | 10 |
| 1985 | 5 |