President of the German Bundesrat
The President of the Bundesrat is usually elected on the 1 November in one year, and serves until the 31 October of the next year. The Basic Law says, in Article 52.1, that "the Bundesrat elects its President for one year". However, in practice the presidency rotates among all Länder equally, in accordance with a predetermined order. The order changes sometimes, because it depends on each state's population.