Slimboyfat Is right when he says Watchtower makes it impossible to gather any statistical evidence, and that in itself gives us some clue.
I am on reddit and there tends to be a younger crowd, many of whom are PIMO. The number of posts grieving for friends who have committed suicide is heartbreaking. Many have recently been DF and are being shunned, many are gay - which is another horrible thing WT does - gay JWs are in the worst of situations, be lonely or be dead at Armageddon. Then again if they feel they can't control their thoughts they are finished. Its heartbreaking.
JWsuicides are one of the things that make me incredibly angry and upset.