Switzerland has an artificially inflated GDP by the allocation of profits not really earned there: this is data distortion
This may also be a factor in HK and Singapore too. Compare with GNP in these cases or better GVA
GNP it appears to be third.
And of course we can’t use GVA because, by definition, we calculate that for less than national economies (because we can only measure taxes and subsidies at the national economy level).
I think we’ll claim that as another victory for Ritchie’s deep and sophisticated knowledge of economics, shall we?