Thanks for the info jwfacts. Your site is an invaluable resource to those who are still in but want to make a rational inquiry into their religon. And great for gathering info for family members who are still in.
Statistics like this are great because you can just mention a few at gathering of freinds and family and you almost sound like a keen WT student while presenting information that could actually weaken there faith/delusion.
In our congregation a while ago we had a local needs part about how to increase your hours in the misery. They stressed the fact that those with kids can count time and a bible study. The brother did the maths of how many actual hours in service those with kids would need to reach the national average compared to those without. It was a bit strange.
The witnessing work is such a drag for many witnesses. No one is interested. Knock on the door hope it's a not at home, don't bother recording them we are back soon enough. On the rare occasion you get through a introduction it's like 'oh crap you didn't shut the door on me, I have to have say something now, here have a watchtower'.