here where I live and work there are no statistics on how many therapy has helped because that is subjective to each clients own reasons why they enter therapy, what their individual goals are and whether that client wants the help they are seeking or being given. you see many people enter therapy and sometimes once therapy begins they may decide that its too hard, not for them or just not ready to face their inner demons so to speak.

that said here where I live and work the state, cities, towns and agencies all keep their own statistical data on how many people are in the mental health system. example at the crisis center where I work at any given time there are well over 2000 clients divided up into caseloads of each treatment provider having a caseload of between 40 and 65 clients a week.

the hospital that I also work at, their statistics are considerably higher.

to find out what the statistics are in your location you can contact any mental health agency in your location. they will be able to tell you how many clients they serve.