China's island province of Hainan raked in 55.07 billion yuan (about $7.78 billion) in duty-free sales in the past nine years, according to customs of the provincial capital city of Haikou.
The actual use of foreign capital in South China's island province of Hainan reached over $115 million in January, surging by over 366 percent year on year, local commercial authorities said.
Overview
Haikou 
Sanya 
