This combo photo shows the Binhai Avenue in Haikou of southernmost China's Hainan Province in 1990 (top) and March 12, 2008. Founded in April of 1988, Hainan special economic zone (SEZ) is one of the five SEZs of China. Over the past two decades, Hainan's economic and social development has made a remarkable progress. The appearance of cities and villages has undergone profound changes.