Kuwait is an emirate. The Emir is the head of state and the Al Sabah is the ruling family which dominates the country's political system. Kuwait's official state religion is Maliki Sunni Islam. Kuwait is a developed country with a high-income economy backed by the world's sixth largest oil reserves. The Kuwaiti dinar is the highest valued currency in the world. Kuwait is the fifth richest country in the world by gross national income per capita. In 2009, Kuwait had the highest Human Development Index in the Arab world. 