SamuelRSmith on 23 May 2009
I think they are able to track different EU countries because the sources of which they get their data from is from firms that only operate in singular EU countries.
In the US a lot of the firms are across-states, and such.
My examples being: if VGC were to get data from GAME, that would mean that they're getting data for just the UK (and RoI, which I think is included in the UK data), however, if they were to get data from their American partner, Best-Buy, the data would be for the entirety of the US.
That's what you get for having open borders for much longer than we have. 
