[44net] network size estimates

I'm working on a presentation about packet networking. Does anyone have a reasonable estimate of: -- The number of BBS Systems reachable via AMPRnet -- The number of BBS Systems reachable via non-AMPRnet BBS forwarding network -- The number of BBS systems connected via both networks Note: This is not an attempt to compare the two. We're connected both ways. AND, I realize that other BBSs also connect to both, so there will be duplication. That's o.k. I'd just like to be able to give people a sense of how big (or small) each of the networks still is. If you have an estimate for any of the above numbers, can you tell me what it is and how you arrived at it? Thanks, Michael N6MEF