[CentOS-mirror] New Mirror Traffic Expectations

Hi,

I'm in the process of setting up 1-4 mirrors and I'm wondering what sort of traffic stats I should expect in general, and then surrounding new releases.  All 4 mirrors would have dedicated gigabit links and be in the following locations:

Baltimore, MD, USA Dallas, TX, USA Seattle, WA, USA Amsterdam, NL

I'm just trying to get an idea of what is actually going to be consumed.  Am I looking at pushing the pipe size a lot of the time or should I expect 10-20Mbps or somewhere in between?  If anyone in similar geographic locations could share some stats that would be great.