A few years ago a Diser compiled all the statistics on when the ship did not dock at CC...it was for a few years I think.
In the whole scheme of things I think it was a small percentage.
Ok...I found one thread from 2003 but that is not the comprehensive one I was thinking of....but it does give a percentage from that time on post #25.
http://www.disboards.com/showthread.php?t=459562&page=2
MJ