Head of State: His Majesty King Norodom Sihamoni Head of Government: Prime Minister Hun Sen Capital : Phnom Penh Language : Khmer Currency : Riel Area: 181,035 km2 Population : 15.40 million (2015) GDP at current market prices : USD 18.5 billion (2015) GDP per capita : USD 1,198.5 (2015) Website:Ministry of Commerce of Cambodia