I appreciate the work, but I am not sure that a logical corelation can be proven. Probably a similar set of graphs could be made for these countries using data for indoor plumbing, or private car ownership.
What we can say is that the WT recruitment is UP in third world countries, and DOWN in advanced nations.
However, isn't it true that in the U.S., growth is mainly in hispanic congregations, not in english speaking areas? And yet, everybody here has pretty much the same access to the internet...
But yes - I really think (just as an opinion) that the internet cannot help but be hurting JW recruiting where it is available.