1869 – late 1870s
1894 – 1909
1909 – c. 1911
1911 – 1926
1928 – 1936
1936 – 1938
1938 – 1948
1948 – 1950
1950 – 1953
1953 – 1966
1966 – 1969
1969 – 1972
1972 – 1977
1977 – 1978
1978 – 1979
1979 – 1981
1981 – mid-1980s
1991 – 2000
2000 – 2015
2015 – 2017
2017 – 2017
2018-Present