For anyone who has been in Portland this year this chart will likely not be a surprise. But it sure is cool to see this! Thanks to Todd at Clever Cycles for pointing this out on his blog. http://clevercycles.com/
Portland Department of Transportation (PDOT) is apparently starting a bike delivery service through their Smart Trips program. I can't seem to find information about the delivery service on PDOT's website or on BikePortland.org. I will call PDOT and ask them about it.