I would suggest that probably around a million-plus Americans (since 2010) packed up and retired to overseas locations (from the Philippines to Australia, From Costa Rica to Argentina, from Spain to Greece, etc). The Census didn’t capture that information. In fact, if you went to most US embassy operations....they give you merely estimates of the Americans who live in these locations.
The trend? It will only continue.
Given what is happening here, I certainly entertain the idea of moving overseas. I can watch America burn from afar.