Elections to the European Parliament take place every five years by universal adult suffrage; with more than 400 million people eligible to vote, they are considered the second largest democratic elections in the world after India's. Until 2019, 751 MEPs were elected to the European Parliament, which has been directly elected since 1979. Since the withdrawal of the United Kingdom from the EU in 2020, the number of MEPs, including the president, has been 705. No other EU institution is directly elected, with the Council of the European Union and the European Council being only indirectly legitimated through national elections. While European political parties have the right to campaign EU-wide for the European elections, campaigns still take place through national election campaigns, advertising national delegates from national parties. Apportionment The allocation of seats to each member state is based on the principle of degressive proportionality, so that, while the size of the population of each country is taken into account, smaller states elect more MEPs than is proportional to their populations. As the numbers of MEPs to be elected by each country have arisen from treaty negotiations, there is no precise formula for the apportionment of seats among member states. No change in this configuration can occur without the unanimous consent of all governments. Voting system There is no uniform voting system for the election of MEPs; rather, each member state is free to choose its own system, subject to certain restrictions: The system must be a form of proportional representation, under either the party list or the single transferable vote system. The electoral area may be subdivided if this will not generally affect the proportional nature of the electoral system. The electoral threshold, if there is any, may not exceed 5%. From the 2024 election there will be a minimum threshold of between 2% and 5% for constituencies with more than 35 seats. Voting difference by country Most of the member states of the European Union elect their MEPs with a single constituency covering the entire state, using party-list proportional representation. There is however a great variety of electoral procedures: some countries use a highest averages method of proportional representation, some use the largest remainder method, some open lists and others closed. In addition, the method of calculating the quota and the election threshold vary from country to country. Countries with multiple constituencies are: Belgium is split into 3