Joel, you said that the witnesses have not grown faster than the population in the last 30 years. I have calculated the numbers and the results are shown next:
The average growth rate of the Witnesses over the last 30 years is about 6%. The world population growth rate is between 1-2%. It is only in the last three years that the Witnesses have shown zero growth or decline in 22 of the developed nations. They are still growing in the underdeveloped nations. The overall global Witness growth rate is about 1/2 of 1% above the population growth rate.
My mother's three aunts came in back in the 30's. One did not live near me, so I don't know how she faired. Of the two aunts, I can only remember them bringing in two people between them, besides my mother. My mother never brought in anyone. I don't think my sister has. She is still a Witness. I never did, but left at the age of 22.