'Apples-to-apples' is the keyword you need to read up on.
If you're going to group countries together in an attempt to prove the measures are working you should be able to take that same theory and do it all over the world. Except if you were to do that then it wouldn't up.
So, sure apples-to-apples buddy. Get to explaining why your theory isn't holding up in the rest of the EU or the states.