I average about 70 clicks per 1000 impressions over the long haul... some days better some days worse but right in that range for all my sites combined. Those are not exact numbers as that is against adsense TOS but pretty much in the ball park.
I get about 5% CTR but very low traffic... this is something that I am really trying to grow at moment..
Alex, this is against TOS. If anyone here was a $%#, they could attempt to rat you out. Just do the %, no one needs to know the rest, that's for you only.