You’ve included several territories in the list which aren’t sovereign states. Why is this?

We include any territory that reports enough accurate data for it to be ranked in the Good Country Index. No judgment is implied about the sovereign status, or otherwise, of any territory included in the list: these are all places that behave like countries to the extent of measuring and reporting their behaviour to the United Nations and other international agencies as if they were countries, and that’s good enough for us.