In fact, there are 19 regular posters, with a further 20 that have posted at some point. There are also some issues I'm trying to track down. One such is that Dave transferred quite a few members across, but some of those went on to register themselves separately, although their original user names still exist. Thee are also a couple of places where I know the members has posted, but the system isn't showing posts against their username.
All in all, however, in forum terms we have a pretty high percentage of our membership posting.