Display Forum Thread Read Count

Hi,

I've done a few searches for this, but if it has been answered I can't find any combination of keywords to narrow down the results to those with this information.

I'm looking to add a column to the forum/board page (the one that lists all of the topics/threads) that displays the number of times the thread has been read.

I think I can probably get my head around how to do the theming for this, but would appreciate if someone could tell me how to get this information from the database - what query would I need to run to bring it back?

Many Thanks,
Gareth