| Year | Count |
|---|---|
| 1932 | 32 |
| 1933 | 15 |
| 1935 | 11 |
| 1937 | 14 |
| 1938 | 16 |
| 1939 | 63 |
| 1940 | 68 |
| 1941 | 115 |
| 1942 | 117 |
| 1943 | 158 |
| 1944 | 89 |
| 1945 | 145 |
| 1946 | 237 |
| 1947 | 205 |
| 1948 | 155 |
| 1949 | 138 |
| 1950 | 145 |
| 1951 | 173 |
| 1952 | 93 |
| 1953 | 161 |
| 1954 | 121 |
| 1955 | 87 |
| 1956 | 103 |
| 1957 | 88 |
| 1958 | 75 |
| 1959 | 89 |
| 1960 | 48 |
| 1961 | 36 |
| 1962 | 24 |
| 1963 | 5 |
| 1964 | 10 |
| 1965 | 5 |
| 1966 | 5 |
| 1967 | 5 |
| 1972 | 6 |
| 1982 | 5 |