Representatives are elected by popular vote using the additional member system, a hybrid of the first-past-the-post election system and party-list proportional representation. The Bundestag has a minimum threshold of either 5% of the national party vote or three (directly elected) constituency representatives for a party to gain representation. The additional member system results in a varying number of seats; since the 2002 elections, there have been 603 seats. The distribution of the seats is calculated by the Hare-Niemeyer method[?]. The overhang seats are distributed according to the vote count separately for each state.