I quoted a PCH peering paper at the Peering Track. (Not violating rules, talking about myself.)
The paper is: https://www.pch.net/resources/Papers/peering-survey/PCH-Peering-Survey-2011.pdf I said “99.97%” of all peering sessions have nothing behind them more than a “handshake” or an email. It seems I was in error. Mea Culpa. The number in the paper, on page one is, 99.52%. Hopefully everyone will read the paper, and perhaps help create better data. -- TTFN, patrick