| Year | Count |
|---|---|
| 1923 | 5 |
| 1931 | 5 |
| 1932 | 8 |
| 1933 | 6 |
| 1934 | 6 |
| 1936 | 6 |
| 1937 | 6 |
| 1940 | 5 |
| 1941 | 11 |
| 1942 | 6 |
| 1943 | 8 |
| 1944 | 6 |
| 1945 | 13 |
| 1946 | 6 |
| 1947 | 10 |
| 1948 | 8 |
| 1950 | 9 |
| 1955 | 6 |
| 1956 | 9 |
| 1957 | 24 |
| 1958 | 42 |
| 1959 | 29 |
| 1960 | 30 |
| 1961 | 36 |
| 1962 | 28 |
| 1963 | 31 |
| 1964 | 28 |
| 1965 | 18 |
| 1966 | 9 |
| 1967 | 6 |
| 1968 | 7 |
| 1969 | 9 |
| 1971 | 6 |
| 1975 | 5 |