https://phys.org/news/2018-07-sex-gender-diversity.html

In 2006, a survey discovered that 1.2 percent of Boston high school students identified as trans.

And in a recent issue of the journal Pediatrics, researchers showed that 2.7 percent of Minnesota's youth identify as trans and gender-nonconforming. Similar to trans, gender-nonconforming describes those who reject gender expectations that assume only females can do femininity while only males can do masculinity.