Estimates of the number of Muslims in EU Member States vary widely, depending on the methodology and definitions used and the geographical limits imposed. Excluding Turkey and the Balkan-regions, researchers estimate that as many as 13 to 20 million Muslims live in the EU: That is about 3.5 - 4% of the total EU population. Muslims are the largest religious minority in Europe, and Islam is the continent's fastest growing religion. Substantial Muslim populations exist especially in Western European countries, including France, Germany, the United Kingdom, Spain, Italy, the Netherlands, Belgium and the Scandinavian Countries. Europe's Muslim populations are ethnically diverse and Muslim immigrants in Europe hail from a variety of Middle Eastern, African, and Asian countries, as well as Turkey. Most Muslim communities have their roots in Western Europe's colonial heritage and immigration policies of the 1950s and 1960s used to counter labor shortages during the period of reconstruction after World War II. These policies attracted large numbers of North Africans, Turks, and Pakistanis. Furthermore, in recent years, there have been influxes of Muslim migrants and political refugees from other regions and countries, including the Balkans, Afghanistan, Iraq, Somalia, and the West Bank and Gaza Strip.