I have never seen this figures before, interesting that anointed are going up and Bethelites are going down. Some factors to be considered:
Automation has made possible to cut down in workers.
Production decrease, they don't need as many people as before due to decreased publication numbers.
Remote work, the commuters were already mentioned, but there is also a lot work done by people with special skills from their homes; some of them are very far away.
Secrecy, I don't think that is so clear cut as to who are they counting, with all the labor and legal implications it could be their intention to show a smaller work force.
So maybe what some might see as a declining operation could be for them a leaner operation.
Thanks for the work.