Singapore is one of the world's major commercial hubs, with the fourth-biggest financial centre and one of the five busiest ports. Its globalised and diversified economy depends heavily on trade In terms of purchasing power parity, Singapore has the third-highest per capita income in the world but one of the world's highest income inequalities. It places highly in international rankings with regard to education, healthcare, and economic competitiveness. Just over five million people live in Singapore, of which approximately two million are foreign-born. While Singapore is diverse, ethnic Asians predominate: 75 percent of the population is Chinese, with significant minorities of Malays, Indians, and Eurasians. There are four official languages, English, Malay, Mandarin, and Tamil, and the country promotes multiculturalism through a range of official policies.