| Year | Count |
|---|---|
| 1936 | 5 |
| 1939 | 7 |
| 1942 | 5 |
| 1943 | 30 |
| 1945 | 29 |
| 1946 | 43 |
| 1947 | 49 |
| 1948 | 36 |
| 1949 | 7 |
| 1950 | 17 |
| 1951 | 9 |
| 1952 | 12 |
| 1953 | 11 |
| 1954 | 51 |
| 1955 | 61 |
| 1956 | 107 |
| 1957 | 203 |
| 1958 | 256 |
| 1959 | 325 |
| 1960 | 342 |
| 1961 | 303 |
| 1962 | 298 |
| 1963 | 278 |
| 1964 | 265 |
| 1965 | 139 |
| 1966 | 71 |
| 1967 | 68 |
| 1968 | 72 |
| 1969 | 40 |
| 1970 | 63 |
| 1971 | 49 |
| 1972 | 5 |
| 1973 | 17 |
| 1974 | 22 |
| 1977 | 5 |
| 1978 | 10 |
| 1979 | 6 |
| 1986 | 6 |