I did not find a statistic with a quick look, but you can easily make your own. Use
/who all cleric count
in order to see how many clerics are there at this time. I think it does not count /anon players (not sure about that), so certain classes, especially clerics druids and wizards might be underrepresented.
Hyprid XP penalty is still in effect, but should be dropped in a few months time.
If you want to group a lot, i would recommend a cleric or a tank. Enchanter is nice as well, but i think there are a lot around, same for shamans.
That said, grouping is not so hard at low levels. Even my necromancer is grouping pretty frequently. At high levels people get a lot more picky though.
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