| Year | Count |
|---|---|
| 1919 | 5 |
| 1920 | 7 |
| 1921 | 6 |
| 1922 | 58 |
| 1923 | 44 |
| 1924 | 18 |
| 1926 | 12 |
| 1927 | 16 |
| 1928 | 10 |
| 1929 | 14 |
| 1930 | 16 |
| 1931 | 12 |
| 1932 | 23 |
| 1933 | 16 |
| 1934 | 28 |
| 1935 | 17 |
| 1936 | 34 |
| 1937 | 17 |
| 1938 | 31 |
| 1939 | 23 |
| 1940 | 41 |
| 1941 | 31 |
| 1942 | 43 |
| 1943 | 41 |
| 1944 | 39 |
| 1945 | 34 |
| 1946 | 35 |
| 1947 | 26 |
| 1948 | 32 |
| 1949 | 34 |
| 1950 | 35 |
| 1951 | 24 |
| 1952 | 30 |
| 1953 | 20 |
| 1954 | 16 |
| 1955 | 15 |
| 1956 | 19 |
| 1957 | 26 |
| 1958 | 18 |
| 1960 | 14 |
| 1961 | 24 |
| 1963 | 5 |
| 1968 | 6 |
| 1970 | 5 |