| Year | Count |
|---|---|
| 1938 | 10 |
| 1939 | 5 |
| 1940 | 37 |
| 1941 | 74 |
| 1942 | 149 |
| 1943 | 192 |
| 1944 | 116 |
| 1945 | 104 |
| 1946 | 136 |
| 1947 | 188 |
| 1948 | 162 |
| 1949 | 135 |
| 1950 | 132 |
| 1951 | 103 |
| 1952 | 97 |
| 1953 | 62 |
| 1954 | 66 |
| 1955 | 54 |
| 1956 | 85 |
| 1957 | 48 |
| 1958 | 62 |
| 1959 | 27 |
| 1960 | 22 |
| 1961 | 14 |
| 1962 | 26 |
| 1963 | 47 |
| 1964 | 13 |
| 1965 | 5 |
| 1967 | 5 |
| 1968 | 11 |
| 1970 | 5 |