They are playing with the congregations, with the consolidation and re-arranging that's going on. All the shuffling about probably has even long time elders getting a distorted view of the growth or lack thereof when they are making smaller language groups(so very few could make up a congregation in a given area) and then larger consolidated congregations to save money and sell off buildings.
Why are people even showing up for the Memorial? I went to one years after I left and while the speaker was excellent, his presentation of the talk just reminded me of unusual it was. He spoke of things that sounded Christian instead of JW-in spite of the stupid JW stuff that couldn't be left out-like reminders not to eat at the lords evening meal and all. But seriously, the memorial is so weird. I can't imagine why any of it convinces a non born in to join or an apostate or df'd one to return.
I have seen more than one hall used for 5-6 congregations (drive by's). My aunts hall had 6 congs that have since been consolidated to 3 (they had shrunk) and now that hall is being made redundant and they are moving to a couple of other halls. I think they may be playing with the numbers more than they will admit because I don't see how they are growing AT ALL.