Population 4,553,009 Official Language(s) English Mandarin Tamil Malay National Anthem Majulah Singapura Capital Singapore City Currency Singapore dollar Government Parliamentary Republic Chief of State - President S R Nathan Head of Government - Prime Minister Lee Hsien Loong Senior Minister - Goh Chok Tong Minister Mentor Lee Kuan Yew Deputy Prime Ministers - Shunmugan Jayakumar and Wong Kan Seng Major Airports Singapore Changi Seletar Miscellaneous Facts founded as a British trading colony in 1819. It joined the Malaysian Federation in 1963 but separated two years later and became independent Total Size - 704.0 square kilometers / 270 square miles Country Code - +65 Internet Extension - .sg Work Force 2.4 million Work Force by Occupation Manufacturing - 18% Construction - 6% Transportation and communication - 11% Financial, business, and other services - 39% Other - 26% Unemployment 3.1% Economy a highly developed market-based economy the busiest port in the world in terms of tonnage shipped rated as the most business-friendly economy in the world Industries financial services oil drilling equipment petroleum refining rubber processing and rubber products processed food and beverages ship repair offshore platform construction life sciences entrepot trade Exports machinery and equipment (including electronics) consumer goods chemicals mineral fuels Imports machinery and equipment mineral fuels chemicals foodstuffs Political parties People's Action Party Singapore Democratic Alliance Singapore Democratic Party Workers' Party