Federal elections took place on 27 September 2009 to elect the members of the 17th Bundestag (parliament) of Germany, the Christian Democrats previously governed in coalition with the FDP in most of the 1982–1998 governments of which German statesman who served as Chancellor of Germany from 1982 to 1998 (of West Germany 1982–1990 and of the reunited Germany 1990–1998) and as the chairman of the Christian Democratic Union (CDU) from 1973 to 1998?