| Year | Count |
|---|---|
| 1915 | 7 |
| 1916 | 5 |
| 1917 | 6 |
| 1923 | 7 |
| 1924 | 6 |
| 1926 | 7 |
| 1928 | 8 |
| 1929 | 6 |
| 1930 | 7 |
| 1931 | 5 |
| 1932 | 10 |
| 1933 | 8 |
| 1934 | 11 |
| 1935 | 5 |
| 1936 | 7 |
| 1937 | 6 |
| 1938 | 13 |
| 1939 | 5 |
| 1940 | 5 |
| 1941 | 5 |
| 1943 | 6 |
| 1944 | 6 |
| 1945 | 8 |
| 1946 | 7 |
| 1947 | 7 |
| 1948 | 10 |
| 1949 | 12 |
| 1950 | 5 |
| 1953 | 7 |
| 1954 | 8 |
| 1955 | 5 |
| 1956 | 6 |
| 1958 | 6 |
| 1959 | 6 |
| 1961 | 7 |
| 1962 | 5 |
| 1963 | 6 |
| 1964 | 8 |
| 1965 | 9 |
| 1966 | 7 |
| 1968 | 5 |
| 1969 | 9 |
| 1971 | 5 |
| 1975 | 5 |
| 1980 | 15 |
| 1983 | 6 |
| 1991 | 6 |
| 1992 | 5 |
| 1993 | 5 |
| 1997 | 5 |
| 1999 | 6 |
| 2001 | 6 |
| 2010 | 6 |
| 2017 | 7 |