I recently read that 23% of US bandwidth was used for "peer to peer" and about 50% used for streaming video [Netflix, Hulu, Youtube, etc].
I don't know what 23% means in actual numbers but that sounds like a huge number of people file sharing.
http://www.reelseo.com/video-50-bandwidth-consumption/
This site breaks it down further. Still about 50% video but says 10% Bittorrent with 15% "other."
http://www.businessinsider.com/chart...AI_COTD_051711