Those numbers are way off, no source is given, it's higher than anywhere else I can find, and the same website seems to think that the average in the UK (where

Those numbers are way off, no source is given, it's higher than anywhere else I can find, and the same website seems to think that the average in the UK (where I live) is also £71k per year while the UK National Statistics Office says it is £31.7k (so under half). So those numbers can't be trusted.