Even on a local level you can see the churn. The congregation I'm "in" over the past year has had 3 baptized (all kids in the 12 y/o range) while 5 df'ed (all unrelated incidents).
I think they're calling members what the WTS records as publishers.
I'll bet in some of the non-English congregations where many of the converts are first generation (both to JWs & to the US) are the ones where there is more being converted than are leaving. It will take a while for them to catch up on the curve. Proof that it will eventually happen to those congregations as well is found in Japan. 10 years ago, all you would hear about is how the Japanese were putting the western countries to shame with their large growth. Now, the growth has slowed to a crawl like the west.
In the not too distant future (5-10 years), the non-English language congos here in the US and western Europe will start taking the same sort of hit out of the back door.