insidetheKH: @redvip that is simply not true. Average anual population growth is now about 1%,.. during the sixties and during the last century it never was higher than about 2%
However the annual growth of JW's was much higher than the average population growth almost every single year. Bisides that many JW couples decide(d) not to take children because they place kingdom interests first or think that this system of things is not the right environment to raise children in,
It seems that you're saying that JW growth rate (baptisms) is greater than JW birth rate, and that therefore, there must be JW recruits from outside JWdom. In other words, it seems that you're saying that if, for example, JW growth (baptisms) is 1.5%, and birth rate among JWs is only 1%, that some of those baptized must be coming from the outside due to the preaching work. If that's what you're saying, then your argument is flawed for several reasons.
Here's one reason the argument is flawed. The internal growth of JWs doesn't come exclusively from children born to JWs as if the tree branches only in one direction; it doesn't. It branches in other directions, also. In my own congregation, there have been four baptisms in the last ten or so years. Not one of the four was the child of a JW, but all four were family members of JWs. Here is a description of them:
1) Teen-aged girl whose mother has JW first cousins
2) Mother of #1. Baptized after #1. As indicated above, she has first cousins who are JWs.
3) Teen-aged girl who has JW relatives, but whose parents are not JWs
4) Elderly man (uneducated and totally clueless) whose daughter is a JW
So these are people who were baptized as JWs, but not because of the preaching work; they became JWs because of connections to JWdom through family members, but they are not the offspring of JWs. So the JW birth rate is not really as relevant as you seem to indicate - as if all JW internal growth is from the direct offspring of JWs. JWs have all kinds of family (& acquaintance) connections that they can look to for growth; they don't have to just to look to the children of JWs. And with most of the newly baptized ones come more connections that can be exploited.