As promised, I compiled all of the publicly available information dating back to the GLBSE days.  All statistics are averages based off of the actual seat trades using the daily USD conversion rates.

Thanks to those who attended the live chat

http://i.imgur.com/HcClRPM.png

http://i.imgur.com/YTC5xeu.png

http://i.imgur.com/LiJl7Jc.png

http://i.imgur.com/ZwSLcR6.png