by Luxembourg, allowing it to schedule them on the same date as elections to the Chamber of Deputies (as is usually the case). Eligibility To be eligible to vote in elections to the European Parliament, one must fulfil the following criteria: One must be a citizen of the European Union. One must be eighteen years of age on election day. One must never have been convicted of a criminal offence. One must otherwise be in full possession of one's political rights (e.g. not be certified as insane) in one's own country of citizenship (Luxembourg or another member state). If not a Luxembourgish citizen, must have been resident in Luxembourg for at least five of the past six years when enrolling on the electoral register. In addition to the criteria outlined above, to stand for election to the European Parliament, one must be resident in Luxembourg. There are also extra requirements if one is a non-Luxembourgish citizen, in which case, one must be in full possession of one's political rights in both Luxembourg and one's country of citizenship (if not a Luxembourgish national), and have resided in Luxembourg for the past five years (and not just five of the past six). Electoral system The seats are allocated according to the D'Hondt method. Latest election Past elections 1999 European election 2004 European election 2009 European election 2014 European election Local elections Each commune (municipality) has an elected communal council. The number of councillors varies from 7 to 19 based on the number of inhabitants; the exception being the City of Luxembourg where its communal council consists of 27 members. The councillors are directly elected every six years on the second Sunday of October. The last elections were held on 8 October 2017. The law of 15 December 2017 further defines that, in case the parliamentary and communal elections coincide, the latter are held in June of that year. Referendums The referendum was introduced into the Constitution of Luxembourg by the constitutional revision of 1919. The Constitution mentions the referendum in Article 51: "Voters will be asked to vote by way of referendum in the cases and under the conditions determined by law." The only details about execution of referendums are found in Article 114 which deals with constitutional amendments. There are no other provisions regarding referendums in Luxembourg. The Constitution amendment first has to be passed by two-thirds absolute super-majority of the