This is a question I would take to a reference librarian....because I have no idea where you would look to find these statistics already compiled.

Here in the States, I think all therapists have to be licensed and maybe they have to officially label their therapy method/approach for their state licensing board. However, just looking online, I've noticed that a therapist will often list many different methods (the eclectic approach), so I don't know how you would sort that out statistically.

I've read that in the U.S. most psychiatrists don't get to do talk therapy or psychoanalysis anymore, because insurance companies won't pay them for it. So I guess many psychiatrists just do medication consults now.

Thank you Rabbit! And brilliant idea: I wrote an email to one of the librarians of my university and I am hoping he will be able to find some answers.

And... that's right, a lot of them have an "eclectic approach", so... maybe I could go with something distinguishing between "psychoanalytical inspiration", behavioural, humanist... And the reasons for the domination of one or another trend are probably not simple, but... I am curious to just have something to back up my experience, and... I must write a cheesy article for my uni newspaper (and feel way out my depth, since I am not a psychology student) but the point will be to show that "mental health can take many forms", so... I won't actually need to write a paper analysing the complexity of the situation (though... I would love to do that in the life in which I have a lot of spare time)
Or I could wonder about the issues suggested by the difficulties to sort them out... *I want to write essays about the art of statistics*

Statistics are scary!

statistics are fun (I don't know the much, though)