Native Spaniards make up 88% of the total population of Spain. After the birth rate plunged in the 1980s and Spain's population growth rate dropped, the population again trended upward initially upon the return of many Spaniards who had emigrated to other European countries during the 1970s, and more recently, fuelled by large numbers of immigrants who make up 12% of the population. The immigrants originate mainly in Latin America (39%), North Africa (16%), Eastern Europe (15%), and Sub-Saharan Africa (4%). In 2005, Spain instituted a three-month amnesty programme through which certain hitherto undocumented aliens were granted legal residency.