What is the recovery rate (with treatment/counseling) for individuals who self harm?

I'm curious how many people return to these destructive habits when they are put under a great deal of emotional stress/turmoil later on? I know that the rate for other disorders, such as anorexia & bulimia nervosa, is reportedly VERY low, but I can't seem to find a valid statistic on this particular problem... Perhaps there isn't enough research in the field?