There was an uptick in those that left after the change in the generation teaching in 1995 . There was again after ARC and now with the child abuse. Also the fact that one can do research online is helping to make the leavers not only increase but less are going back.
As more and more child abuse gets reported I think the leavers will continue to increase. What really helps is JWs talk to their families and more leave do to this despite all the GB are doing to try and stop it.