Politically, Albania is a unitary parliamentary constitutional republic and a developing country with an upper-middle income economy dominated by the service sector, followed by manufacturing. It went through a process of transition following the end of communism in 1990, from centralized planning to a market-based economy. Albania provides universal health care and free primary and secondary education to its citizens. Albania is a member of the United Nations, World Bank, UNESCO, NATO, WTO, COE, OSCE, and OIC. It is an official candidate for membership in the European Union. It is one of the founding members of the Energy Community, including the Organization of the Black Sea Economic Cooperation and Union for the Mediterranean.