| Year | Count |
|---|---|
| 1916 | 7 |
| 1917 | 6 |
| 1918 | 5 |
| 1919 | 6 |
| 1920 | 5 |
| 1921 | 9 |
| 1924 | 10 |
| 1926 | 14 |
| 1928 | 10 |
| 1931 | 6 |
| 1937 | 8 |
| 1938 | 5 |
| 1940 | 6 |
| 1942 | 5 |
| 1943 | 7 |
| 1944 | 6 |
| 1946 | 8 |
| 1947 | 6 |
| 1948 | 6 |
| 1949 | 8 |
| 1950 | 11 |
| 1951 | 7 |
| 1952 | 10 |
| 1954 | 12 |
| 1958 | 14 |
| 1959 | 18 |
| 1960 | 18 |
| 1961 | 7 |
| 1962 | 10 |
| 1963 | 10 |
| 1964 | 8 |
| 1965 | 9 |
| 1966 | 5 |
| 1976 | 8 |
| 1983 | 5 |
| 1984 | 5 |
| 1988 | 6 |
| 1990 | 7 |
| 1997 | 7 |
| 2001 | 7 |