I don't have many of the White Wolf books so this is a mystery to me. In the 'standard' World of Darkness (revised edition if it matters) how many supernatural creatures are there likely to be per hundred thousand/million ordinary humans in a modern European city?
e.g. Edinburgh has a population of roughly half a million, how many Garou, Changing Breeds, Vampires, and other creatures, live in the city? Whereas London has a population of over ten million so how many creatures live there in comparison?
I'd love to quote the oft touted thing about how predator-prey populations in the Savannah exactly match missing persons cases but I'll be damned if I can find a good reference for it.
There's some information on Vampires in this question but what about everything else?