(Found link on ynotmasters)
http://www.theregister.co.uk/content/6/29537.html
....Traffic over the Internet is set to double every year for the next five years, according to IDC.
The market research firm predicts the volume of Internet traffic generated by end users worldwide will nearly double annually between 2002 and 2007. This will mean an increase in traffic from 180 petabits per day in 2002 to 5,175 petabits per day by the end of 2007......
I think maybe they are giving too much weight to proxy based hitbot users.
