This statistic seems bogus no matter how I try to figure it. From wikipedia (https://secure.wikimedia.org/wikipedia/en/wiki/Internet_traf...), the total internet traffic in 2008 was estimated at 7639PB. And for 2010, that number had only doubled compared to 2008. Presumably 2011 is along the same trend line.
I plugged this into wolfram alpha:
7639PB / month
Which yields a whopping 23.25Tb/sec (Terabits). So each of 20 households would have to be generating ~1Tb/sec continuously every second of every day.
If so, I think I'm going to need a bigger bandwidth cap.
I also tried 1998's number, but each house would still have to be generating 1.67Gbps.