Sri Lanka, officially the Democratic Socialist Republic of Sri Lanka, is an island country in the northern Indian Ocean off the southern coast of the Indian subcontinent in South Asia. It was known as Ceylon until 1972. It shares its maritime borders with India to the northwest and the Maldives to the southwest. Sri Lanka is a republic and a unitary state governed by a presidential system. The capital is Sri Jayawardenepura Kotte which is for administrative purposes which is a suburb of the largest city Colombo. The country has had a long history of international engagement, being a founding member of SAARC and a member of the United Nations, the Commonwealth of Nations, the G77 and the Non-Aligned Movement. It is the only country in South Asia that is rated high on the Human Development Index presently. According to IMF, As of 2010, Sri Lanka was one of the fastest growing economies of the world. Its stock exchange was Asia's best performing stock market during 2009 and 2010.