June 25, 2018 (Xinhua) -- The Chinese mainland saw inbound and outbound tourists reach 139 million and 131 million in 2017, up by 0.8 percent and 6.9 percent respectively. Outbound tourists spent 115.29 billion U.S. dollars on their trips, up by 5 percent year on year. In comparison, foreign visitors to China reached 29.1 million, up by 3.6 percent, bringing in 69.5 billion U.S. dollars of revenue. Chinas outbound tourism market is estimated to increase by 5 percent annually on average in the coming years.