The Riksdag is made up of 349 seats, and all are elected through open list proportional representation on multi-member party lists.[37] Sweden has the distinction of having elections on fixed date with a parliamentary system in which early elections can be called. In the latter case, the newly-elected legislature would serve the remainder of the four-year term begun by the previous legislature. Elections are organized on the second Sunday of September every four years, at the same time as the municipal and regional elections.[38] Each of the 29 constituencies has a set number of parliamentarians that is divided through constituency results to ensure regional representation.