DA NANG, Vietnam, Nov. 11 (Xinhua) -- With 750 million Internet users, China's online retail sales are growing by 30 percent a year, with sharing economy volume reaching 3.5 trillion RMB (around 528 billion U.S. dollars) and mobile payment transactions surpassing 158 trillion RMB (23.84 trillion dollars), Chinese President Xi Jinping said here Saturday at the Asia-Pacific Economic Cooperation Economic Leaders' Meeting.