This combo photo shows the Changdi Avenue in Haikou of southernmost China's Hainan Province in Dec. 9, 1992 (top) and March 21, 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.