population is irreligious or adheres to other denominations or religions. North Rhine-Westphalia ranks first in population among German states for both Roman Catholics and Protestants. In 2016, the interior ministry of North Rhine-Westphalia reported that the number of mosques with a Salafist influence had risen from 3 to 9, which indicated both an actual increase and improved reporting. According to German authorities, Salafism is incompatible with the principles codified in the Constitution of the Federal Republic of Germany, in particular: democracy, the rule of law, and political order based on human rights. Politics The politics of North Rhine-Westphalia takes place within a framework of a federal parliamentary representative democratic republic. The two main parties are, as on the federal level, the centre-right Christian Democratic Union and the centre-left Social Democratic Party. From 1966 to 2005, North Rhine-Westphalia was continuously governed by the Social Democrats or SPD-led governments. The state's legislative body is the Landtag ("state diet"). It may pass laws within the competency of the state, e.g. cultural matters, the education system, matters of internal security, i.e. the police, building supervision, health supervision and the media; as opposed to matters that are reserved to Federal law. North Rhine-Westphalia uses the same electoral system as the Federal level in Germany: "Personalized proportional representation". Every five years the citizens of North Rhine-Westphalia vote in a general election to elect at least 181 members of the Landtag. Only parties who win at least 5% of the votes cast may be represented in parliament. The Landtag, the parliamentary parties and groups consisting of at least 7 members of parliament have the right to table legal proposals to the Landtag for deliberation. The law that is passed by the Landtag is delivered to the Minister-President, who, together with the ministers involved, is required to sign it and announce it in the Law and Ordinance Gazette. List of Ministers-President These are the Ministers-presidents of the Federal State of North Rhine-Westphalia: For the current state government, see Wüst cabinet. Culture Architecture and building monuments The state is known for the most castles and fortresses in Germany. North Rhine-Westphalia has a high concentration of museums, cultural centres, concert halls and theatres. Historic monuments Modern architecture World Heritage Sites The state has Aachen Cathedral, the Cologne Cathedral, the Zeche Zollverein in Essen, the Augustusburg Palace in Brühl and the Imperial Abbey of Corvey in Höxter which are all World