| Year | Count |
|---|---|
| 1928 | 5 |
| 1933 | 10 |
| 1934 | 5 |
| 1935 | 24 |
| 1936 | 49 |
| 1937 | 10 |
| 1938 | 24 |
| 1939 | 33 |
| 1940 | 29 |
| 1941 | 33 |
| 1942 | 34 |
| 1943 | 105 |
| 1944 | 61 |
| 1945 | 79 |
| 1946 | 60 |
| 1947 | 137 |
| 1948 | 102 |
| 1949 | 112 |
| 1950 | 96 |
| 1951 | 136 |
| 1952 | 221 |
| 1953 | 173 |
| 1954 | 162 |
| 1955 | 151 |
| 1956 | 194 |
| 1957 | 169 |
| 1958 | 172 |
| 1959 | 256 |
| 1960 | 290 |
| 1961 | 203 |
| 1962 | 173 |
| 1963 | 97 |
| 1964 | 102 |
| 1965 | 60 |
| 1966 | 30 |
| 1967 | 26 |
| 1968 | 20 |
| 1970 | 16 |