| Year | Count |
|---|---|
| 1937 | 6 |
| 1938 | 10 |
| 1940 | 112 |
| 1941 | 140 |
| 1942 | 96 |
| 1943 | 118 |
| 1944 | 86 |
| 1945 | 69 |
| 1946 | 106 |
| 1947 | 104 |
| 1948 | 104 |
| 1949 | 109 |
| 1950 | 91 |
| 1951 | 82 |
| 1952 | 30 |
| 1953 | 83 |
| 1954 | 105 |
| 1955 | 84 |
| 1956 | 62 |
| 1957 | 70 |
| 1958 | 41 |
| 1959 | 42 |
| 1960 | 11 |
| 1961 | 40 |
| 1962 | 35 |
| 1963 | 33 |
| 1964 | 40 |
| 1965 | 9 |
| 1966 | 10 |
| 1967 | 12 |
| 1968 | 5 |
| 1970 | 6 |