if we assume that people post at the same rate as they always do (clearly wrong) then simply counting the number of authors over a period of time will tell you whether the numbers are growing, or stagnant. it might also be possible to apply capture-recapture reasoning here:
having subscribed to this list (with different email addresses) since 1992 or so, in my experience the numbers of postings hasn't dramatically increased over time. this makes me think that the numbers of subscribers is fairly constant and probably fairly low. i would guess we have in the hundreds of people.
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