i dont have all the numbers matey, Woody is your man for that, he also knows the number of each colour i think, PM him, he will probably be more than happy to help.
This is what i know...
Around 417 UK GS's, this includes 15 MC Victory and 24 Spyder.
There are 4 yellow GS's, 3 coupe and 1 Spyder, the coupe are 2004 54, 2005 55 and 2007 07, the yellow spyder is a 2007 07.
There are 3 green GS, 2 coupe 1 spyder, the coupe's are 2005 55 and 2007 07 i think, not sure about spyder.
There are 3 Rosso GS Spyders, 2 are Rosso Mondiale and the other is a dark red like the one in my avatar, cant remember the name of it.
Woody will be able to help you a little more.
A GS MCV would certainly be a nice car Dem, they do it in black as well, of the 15 u.k GS MCV i am not sure how many are black, i would say about 11 are blue and 4 are black. Dont think there is a white or red or yellow GS MCV in the u.k.
Hope this has helped.