| Year | Count |
|---|---|
| 1927 | 14 |
| 1928 | 7 |
| 1931 | 5 |
| 1932 | 10 |
| 1933 | 17 |
| 1934 | 6 |
| 1935 | 8 |
| 1937 | 8 |
| 1938 | 5 |
| 1939 | 6 |
| 1941 | 5 |
| 1943 | 10 |
| 1944 | 5 |
| 1945 | 5 |
| 1947 | 10 |
| 1949 | 28 |
| 1950 | 17 |
| 1951 | 8 |
| 1952 | 6 |
| 1953 | 425 |
| 1954 | 510 |
| 1955 | 351 |
| 1956 | 366 |
| 1957 | 262 |
| 1958 | 210 |
| 1959 | 194 |
| 1960 | 180 |
| 1961 | 144 |
| 1962 | 45 |
| 1963 | 62 |
| 1964 | 52 |
| 1966 | 5 |
| 1967 | 10 |
| 1975 | 15 |