Anyway, dunno if all those 'stats' can be taken seriously.
IQ testing is notoriously subjective even when carried out by experts. Within a country, there's a huge divergence between rural and urban which doesn't reflect empirically observed reality (or school exam results)
At least one of the main comparison tables is based on self-administered tests organised by TV companies. Who would you trust more to self- administer without cheating? Norway or Italy? The UK or Greece? France or Bulgaria? What about Poland?