Anyone got numbers on peering vs transit?

Hello, I wonder if anyone has done any estimates on how many percent of the Internet traffic: A) does not pass a peering relationship (i.e. is AS internal or passes through transit connections only) B) passes a public peering relationship C) passes a private peering relationship I know this is fairly impossible to estimate globally, so even any local or network specific research is appreciated. -- Aleksi Suhonen / Axu TM Oy Internetworking Consulting Cellular: +358 45 670 2048 World Wide Web: www.axu.fi