Seems tourism to the States is down for visitors from the UK, Japan, and Germany, at least over the past ten years. As you might expect the People's Republic of China leads the pack with a whopping 221% increase from 2000 to 2010. India is not far behind with 137%.
The rest of the list includes Canada, Mexico, France, Brazil, South Korea, Australia, Italy, Spain, The Netherlands, and Columbia.
Check out http://tinet.ita.doc.gov/ for more info.