How can I find out what percentage of travelers from the US to China are there for business?

I found a report on the website of CNTA. It states that there are totally 26 million inbound visitors; 5.38 million of them are for business, covering 21% of the whole number. 32% are for sightseeing and leisure.
According to a statistic published by Ministry of Education in 2015, there are 400 thousand of overseas students studying CN; it covers a percentage of 2%.