OK, here is what I know. At one point, there was a chart of race and class experience modifiers. Whether that is still around or not, I dont know, because I cannot seem to find it. (If anybody knows where I can find it, please let me know...)
I do know that according to the chard Halflings get a +20%, while high elfs get a -20%. I dont know where Wood elfs fall.
Druids also get a +20%, while Paladins get a -20%.
If you can find that chart, it would answer your question better than I can.