Thanks Stuckinarut. Bit of humor I threw in at the last moment.
SBF - The information about the average age of JWs getting older is very interesting because increasing average ages of religious believers are strongly correlated with decline.
We have both mentioned this on previous threads, and I think we both agree median age or average age is a reliable predictor of whether decline is coming. Unfortunately, I had extracted some additional data that I did not realise the significance of, until now. (It is complicated, and I have to work out a way of tabulating it in an easy to understand way)
Essentially, people between the ages of 15 to 25 leave the religion in droves. However, it appears that a number of people come back to the religion as they get older, in a continuous trickle, especially as they are having kids. They probably drag spouses in at the same time. (There are other ways to interpret the data, but that is my guess at the moment.) The number of people who do return are a significant minority, and the religion would have already been in numerical decline if it was not for them. This makes a difference to how you interpret the median figures.
On a brighter note, in the 2006 census, there were 80,918 JW's. In 2011 the number was 85,635. However, 3472 of those 85,635 reported that they were not living in Aust in 2006 (Aust has a very high immigration intake). Hence, without immigration, the total increase for the 5 year period from 2006 to 2011 would have been only 1,245.
I'll try to put up some more tables when I get the chance.