20 17 why does American tourism revenue exceed expenditure?

In 20 17, American tourism revenue exceeded expenditure, which is a new category. 20 17 added travel consultants (travel agencies and travel guides). Tourism consultants accounted for the highest proportion in 20 17, reaching 33%. The total data of five categories, such as travel agencies, travel experts, travel guides and travel consultants, add up, which makes the tourism income in the United States exceed the expenditure.