But if a party wins more constituency seats than its share of the party votes, then it keeps those extra seats. These extra seats, or "extra mandates", are the reason the Bundestag sometimes has more than 598 members. If a party gets extra mandates, the other parties get some extra seats too to make sure every party gets exactly its share of party seats. This system of giving extra mandates was changed in 2013. Before 2013, if a party won extra mandates, then it got to put more members in the Bundestag, which gave the party more influence over the Bundestag than it won in the elections. 