| Year | Count |
|---|---|
| 1914 | 5 |
| 1915 | 5 |
| 1918 | 7 |
| 1920 | 6 |
| 1921 | 16 |
| 1922 | 6 |
| 1924 | 8 |
| 1925 | 7 |
| 1926 | 6 |
| 1927 | 6 |
| 1928 | 16 |
| 1929 | 8 |
| 1930 | 5 |
| 1939 | 6 |
| 1940 | 6 |
| 1941 | 7 |
| 1942 | 6 |
| 1943 | 5 |
| 1944 | 11 |
| 1945 | 8 |
| 1947 | 33 |
| 1948 | 9 |
| 1949 | 6 |
| 1955 | 30 |
| 1956 | 10 |
| 1957 | 14 |
| 1958 | 10 |
| 1959 | 10 |
| 1960 | 18 |
| 1963 | 14 |
| 1964 | 12 |
| 1968 | 10 |
| 1974 | 5 |
| 1980 | 7 |
| 1981 | 7 |
| 1987 | 8 |
| 1988 | 7 |