| Year | Count |
|---|---|
| 1920 | 5 |
| 1921 | 5 |
| 1925 | 20 |
| 1926 | 20 |
| 1927 | 24 |
| 1934 | 29 |
| 1936 | 24 |
| 1941 | 10 |
| 1942 | 18 |
| 1946 | 10 |
| 1948 | 5 |
| 1949 | 10 |
| 1950 | 23 |
| 1951 | 5 |
| 1952 | 18 |
| 1954 | 10 |
| 1955 | 22 |
| 1956 | 16 |
| 1957 | 12 |
| 1958 | 25 |
| 1959 | 38 |
| 1961 | 28 |
| 1962 | 29 |
| 1963 | 12 |
| 1964 | 28 |
| 1965 | 35 |
| 1966 | 15 |
| 1967 | 54 |
| 1968 | 18 |
| 1969 | 17 |
| 1970 | 42 |
| 1971 | 5 |