It's great seeing wide-spread news about the JWs that isn't BS. It's been about 20 years since I was active, but when I think back about how many were in when I started, and how many of them were around when I left, I believe the 2/3 rate loss is what I experienced.
Most of the so-called JW growth in the US is from kids being pressured into the sect. A few years later they're disfellowshipped, followed by Mom and Dad not talking to them. As my stats prof used to say, "Facts don't lie, but liars figure." This comes to mind when hearing about the wonderful JW growth.
Thanks for posting all of the links--very interesting!!!