| Year | Count |
|---|---|
| 1934 | 43 |
| 1935 | 55 |
| 1936 | 93 |
| 1937 | 157 |
| 1938 | 161 |
| 1939 | 212 |
| 1940 | 359 |
| 1941 | 453 |
| 1942 | 528 |
| 1943 | 340 |
| 1944 | 283 |
| 1945 | 234 |
| 1946 | 334 |
| 1947 | 391 |
| 1948 | 346 |
| 1949 | 658 |
| 1950 | 634 |
| 1951 | 504 |
| 1952 | 374 |
| 1953 | 368 |
| 1954 | 186 |
| 1955 | 287 |
| 1956 | 304 |
| 1957 | 174 |
| 1958 | 234 |
| 1959 | 132 |
| 1960 | 205 |
| 1961 | 106 |
| 1962 | 94 |
| 1963 | 68 |
| 1964 | 71 |
| 1965 | 62 |
| 1966 | 75 |
| 1967 | 76 |
| 1968 | 30 |
| 1969 | 48 |
| 1970 | 61 |
| 1971 | 22 |
| 1972 | 34 |
| 1973 | 25 |
| 1974 | 30 |
| 1975 | 12 |
| 1976 | 18 |
| 1977 | 22 |
| 1979 | 7 |
| 1980 | 12 |