Singapore is the world's fourth leading financial centre, and its port is one of the five busiest ports in the world. The economy depends heavily on exports and refining imported goods, especially in manufacturing, which constituted 26% of Singapore's GDP in 2005. Singapore has the third highest per capita income in the world. There are slightly over 5 million people in Singapore, of which 2.91 million were born locally. The population is highly diverse; the majority are Chinese, with Malays and Indians forming significant minorities. Reflecting this diversity, the country has four official languages: English, Chinese, Malay, and Tamil.