What percentage of PageRank is lost through a 301 redirect?

Roughly what percentage of PageRank is lost through a 301 redirect? Sam Harries, Exeter, United Kingdom Have a question? Ask it in our Webmaster Help Forum: groups.google.com Want your question to be answered on a video like this? Follow us on Twitter and look for an announcement when we take new questions: twitter.com More videos: www.youtube.com Webmaster Central Blog: googlewebmastercentral.blogspot.com Webmaster Central: www.google.com