The charts above are from the Gallup Poll. They show that the number of Americans willing to identify as members of the LGBT community is growing each year. In 2012, that number was only 3.5% of the population. By 2020, that had climbed to 5.6%.
This is not because more people are LGBT, but because more people are now willing to admit it as the community has achieved broad acceptance in the country.
And that is also exhibited by the fact that each generation has more willing to say they are LGBT than the previous generation. The most willing is Generation Z (born 1997 to 2002), where 15.9% say they are LGBT -- as compared to 9.1% of Millennials, 3.8% of Generation X, 2.0% of Baby Boomers, and 1.3% of the Silent Generation.
The area most claim is bisexual (54.6% of LGBT community). About 24.5% say they are gay, 11.7% claim to be lesbian, and 11.3% as transgender.