I think looking at the website you have to add about half a dozen variants together to get the MK7 GTi figures basically any GTI with registrations and tax data from 2013 onwards, GTi TSI, GTI TSI S-A and GTI Launch god knows what they all are but its down to what's on the V5 I think.
Don't you think that the number on the road is a personal thing. You just notice them more once you have one whatever it may be. I have always found myself saying things like "getting a new car next week, don't see many of those on the road" then two weeks after collection they seem to be everywhere. It must be a subconscious thing. There is a rather nice 15 plate R parked in a side street opposite my road, probably been there since first registered but I only noticed it after I picked up my GTi in November!