Directorship term 1802–1832.
Directorship term 1832–1834.
Directorship term 1834–1840.
Directorship term 1840–1858.
Directorship term 1858–1862.
Directorship term 1863–1896.
Directorship term 1896–1904.
Directorship term 1904–1929.
Directorship term 1929–1930.
Directorship term 1931–1939.
Directorship term april — december 1939.
Directorship term 1939–1941.
Directorship term 1941–1960.
Directorship term 1960–1963.
Directorship term 1964–1969.
Directorship from 1970