I'm sure there is some data available, but my thoughts are that most producers on the smaller end are not very likely to tell anyone how many taps they have, as the size of an operation gets larger I suspect more start to chime in.
Even for figures on the agg census questionares too many refuse to answer. Good luck getting that info.
Dave Klish, I recently bought a 2x6 wood fired evaporator from A&A Sheet Metal which I will be converting to oil fired
Now have solar, 2x6 finish pan, 5 bank 7x7 filter press, large water jacketed bottler, and tankless water heater.
Recently bought another Gingerich RO, this one was a 125, but a second membrane was added thus is a 250, like I had.
After running a 2x3, a 2x6, 3x8 tapping from 79 taps up to 1320 all woodfired, now I'm going to a 2x6 oil fired and a 200-425 taps.