Those numbers indicate total registered members I assume, and includes those who are inactive or died. MERB was born in 2003 and I was registered from the beginning which I think was May 2003 but due to a bug/glitch in software at the time, Fred had to cancel my original EB account and delete around 1,000 posts and then start a new account in the same name. So I may count as 2. But I have been here from the beginning and I can recall several members (including all of the significant early posters), either moved away like Bob Crane, became inactive, in some cases retired and in a few cases passed away, like Lewlo, may he rest in peace.
Tony accounts for 5,000 or more members.
I would say active members are half of the total. Maybe less.