Bangkok is the economic centre of Thailand, and the heart of the country's investment and development. In 2010, the city had an economic output of 3.142 trillion baht (US$98.34 billion), contributing 29.1 percent of the gross domestic product (GDP). This amounted to a per-capita GDP value of 456,911 baht ($14,301), almost three times the national average of 160,556 baht ($5,025). The Bangkok Metropolitan Region had a combined output of 4.773 trillion baht ($149.39 billion), or 44.2 percent of GDP. Bangkok's economy ranked as the sixth among Asian cities in terms of per-capita GDP, after Singapore, Hong Kong, Tokyo, Osaka–Kobe and Seoul, as of 2010.