It's pretty much time/server/level dependant....but my experience (and the eq2census figures seem to coroborate it) is a lack of high level Shamans (Defilers in particular)....Chanters (Coercer more....though Illusionist as well)....and both bards (Dirges/Troubadours). Inquisitors are also rarish.
I'm on Unrest.
Guild Leader of The Shard Collectors
Unrest (EQ2) and Byriel (Rift) Servers