Uh, I have no idea how you'd generate the number I'm about to suggest (GURPS Mysterious Places, maybe?), but how about adding in the number of mystic places in the region. The logic is: the more mystic sites, the more mystic stuff is going to happen or have to be protected against. Ergo, the more mystic protectors.
In Europe, I'd definitely factor in the number of standing-stone sites (since they're part of the ley-line network), maybe the number of cathedrals, places like Lourdes, haunted houses, etc.
BTW, is he calculating the number of Heroes or just folks with unusual abilities?
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"I'm sick of chasing my dreams, man; I'm just gonna ask where they're going and hook up with them later." _Mitch Hedberg
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"In my experience, all the best plans end with the same five words ... 'and then, run like hell'."
-- Blues
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