Well first of all not all therapists may called doctors.
A medical doctor in this context is someone who spent 5 years at medical school, and about seven years residency, holds an MBBS or MD degree and is generally medically qualified. Many therapists hold other qualifications and degrees including in some cases Phd's - A phd entitles you to the academic title of doctor - not the medical title, so you have to be very careful who you are including as a doctor. Most therapists, though educated to high degree level are technically NOT medical doctors.
So my answer 70 - 90 % was based on those who are MEDICAL doctors ONLY and in that category I am aware that for the last twenty years almost all medical schools have included some teaching on trans medicine. I know this because of course I am at medical school myself now, and I have recently completed writing a dissertation about aspects of the history of medical education, in the course of which I did quite a lot of research into things that interested me.
So... for medical doctors only I would say the figure is actually about 70% - it drops a lot if you add in therapist because many of them tend to be trained only in their own areas and disciplines, where all doctors will have had a general training before they do their specialities.
Now despite that encouraging 70% figure, that sadly doesnt translate to 70% being helpful because of that 70% who have knowledge, perhaps as many as 25% may have objections to the treatment for one reason or another, and of those who are left standing maybe only half of them will actually be practicing in a relevant speciality. So in practical terms its not quite so good - but as time goes on it is thankfully going to steadily improve.
