Censuses continued to be carried out until 1970.[15] Large scale immigration from Muslim countries began in the 1950s.[16] Due to the expansion of Denmark's post-war economy and increase in industrialization in the 1950-1960s, a large number of immigrants migrated to the country from the highly-Muslim populated nations of Yugoslavia, Turkey, Pakistan, and North Africa.[17] This period was the first wave of large-scale Muslim immigration to Denmark.