| Year | Count |
|---|---|
| 1921 | 5 |
| 1922 | 6 |
| 1924 | 5 |
| 1926 | 15 |
| 1930 | 15 |
| 1933 | 5 |
| 1939 | 5 |
| 1940 | 36 |
| 1941 | 90 |
| 1942 | 53 |
| 1943 | 115 |
| 1944 | 110 |
| 1945 | 181 |
| 1946 | 106 |
| 1947 | 217 |
| 1948 | 118 |
| 1949 | 71 |
| 1950 | 59 |
| 1951 | 81 |
| 1952 | 87 |
| 1953 | 64 |
| 1954 | 59 |
| 1955 | 72 |
| 1956 | 53 |
| 1957 | 35 |
| 1958 | 42 |
| 1959 | 34 |
| 1960 | 20 |
| 1961 | 18 |
| 1962 | 12 |
| 1964 | 9 |
| 1965 | 9 |
| 1966 | 5 |
| 1968 | 7 |
| 1969 | 7 |
| 1970 | 5 |
| 1973 | 5 |