Singapore is the center of South Asian Economy and one of the most global and virant cities in the world. 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 more than one fourth of Singapore's GDP. In terms of purchasing power parity, Singapore has the third highest per capita income in the world. Singapore is one of the original Four Asian Tigers. The 2011 Index of Economic Freedom ranks Singapore as the second freest economy in the world. According to the Corruption Perceptions Index, Singapore is consistently ranked as one of the least corrupt countries in the world. Local foods such as chilli crab, pepper crab, and drunken prawns are recommended for those who visit Singapore first time.