This is meaningless without a denominator. How much has international tourism increased in those years? What percentage of international tourists visited the US before and after 2001?
Anyways, let's compare to more "welcoming" places. This shows the slope of the data, so it's pretty easy to compare the changes between countries.
https://ourworldindata.org/grapher/international-tourist-tri...
If you have data that shows otherwise, feel free to share it.