Percentage of HFA

I was trawling through some data, and I wondered if anyone has any official percentage of HFA (high functioning autistics) over the general population of ASD people. The psychiatrist and the therapist at PsychiatryUK told me that high functioning people (able to work privately and live independently) are a minority, but declined to give me any numbers. We also agreed that the "math genius" archetype of ASD adult is way overrepresented in media, since it is quite rare in real life.

Does anyone have any hard data about that?

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