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According to the DSM-5, the prevalence of gender dysphoria in people born male is somewhere between 0.005% to 0.014%. In people born female, it's between 0.002% to 0.003%.
According to a report made by the Williams Institute of UCLA, there are an estimated 1.6 million people who identify as transgender in the United States, which has a total population of 331.9 million. This means that people who identify as transgender make up approximately 0.5% of the population.
I just thought that was interesting.