(figures from paint manufacturer Standox Germany)
Looking at the cars loading on the Shuttle in both directions I came to these proportions:
Dark grey/black (mainly grey) 60%
Everything else (essentially "blue") 5%
Surprised to see black so high up - it's used as a colour for large SUVs and limousines, but not really for everyday cars.
Brown is up to 6% from about zero!
MG is offering bright, attractive colours as well as white, black, grey and silver. Wonder how well they are selling?