Ah, I forgot to add the citation on that line. The spending numbers come from the CIA World Factbook site, [0] above.

Your number likely includes State, Regional, and Local spending (which was presumably excluded for all nations in my numbers).

Even with the 33% figure, for the US to make up the ~15% difference would require ~3 Trillion in annual spending.

The existence of Social Healthcare programs in those countries is a huge chunk of the difference, I'm sure.