Honestly, no.
I've been a member for close to three years and I've never really known how many active, contributing members we've had at any one time. Some members work like hell for a few months, drop off the face of the earth for a while, and later return and make productive contributions again. Some work in areas in which I can tell how much they're contributing, others work in areas I'm not familiar with. Some members join with the understanding that they will do one very specific task. Every member is unproductive for periods of time, whether because of life, school, work, or (ahem!) Carnival.
So I can't answer your question, and I'd be a bit surprised if anyone could.
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