Housing in rural areas is privately owned. Most of these homes, built with traditional materials, deteriorate in a relatively short time; an increasing number of people now build their homes with more permanent materials. The central government is responsible for all housing projects and works closely with local authorities. Many new housing projects have been undertaken with financial aid from the National Housing Corp. According to the latest information available, total housing stock in the 1980s stood at 3,470,000, with 6.1 people per dwelling.