The economy of Mali is based to a large extent upon agriculture, with a mostly rural population engaged in subsistence agriculture. Mali is among the ten poorest nations of the world, is one of the 37 Heavily Indebted Poor Countries, and is a major recipient of foreign aid from many sources, including multilateral organizations (most significantly the World Bank, African Development Bank, and Arab Funds), and bilateral programs funded by the European Union, France, United States, Canada, Netherlands, and Germany. Before 1991, the former Soviet Union, China and the Warsaw Pact countries had been a major source of economic and military aid.