Singapore is one of the world's leading commercial hubs, with the fourth-biggest financial centre and one of the five busiest ports. Its globalized and diversified economy depends heavily on trade, especially in manufacturing, which constituted 26 percent of Singapore's GDP in 2005. In terms of purchasing power parity, Singapore has the third-highest per capita income in the world. It ranks high in international rankings of education, healthcare, government transparency, and economic competitiveness.