Here is the GLAAD survey pdf where the data is.
Here is my imgur gallery.
The data is from four age ranges. I show them in reverse order to simulate how the LGBT community has changed over time. Obviously this isn't exactly accurate, as Tumblr ideas have infected those who are old enough to know better, but I don't know of surveys that capture the additions over time.
The first chart shows LGBT identity. It increases from 5% to 20% of the population. It also shows the division between "cisgender, not strictly heterosexual", "non-cisgender, strictly heterosexual", and "non-cisgender, not strictly heterosexual". While the "cisgender, not strictly heterosexual" group grows, the "non-cisgender, not strictly heterosexual" grows the most in the 18-34 age range. In fact, in the 18-34 range, 12% are trans-identified, compared to 8% who are just non-heterosexual.
The next two charts break down sexuality and gender identity.
This chart shows sexuality. Of note LG remains relatively flat, increasing only to 3% of the population, while total non-heterosexuality rises to 16%. Bisexuality rises greatly. Interestingly no one identified as Queer.
This chart shows gender identity. Transgender rises only to 2%, while total non-cisgender rises to 12%.
[–]reluctant_commenter 20 insightful - 2 fun20 insightful - 1 fun21 insightful - 1 fun21 insightful - 2 fun - (2 children)
[–]MezozoicGayoldschool gay 9 insightful - 3 fun9 insightful - 2 fun10 insightful - 2 fun10 insightful - 3 fun - (0 children)
[–]XirallicBolts 6 insightful - 1 fun6 insightful - 0 fun7 insightful - 0 fun7 insightful - 1 fun - (0 children)
[–]reluctant_commenter 13 insightful - 1 fun13 insightful - 0 fun14 insightful - 0 fun14 insightful - 1 fun - (1 child)
[–]slushpilot 5 insightful - 1 fun5 insightful - 0 fun6 insightful - 0 fun6 insightful - 1 fun - (0 children)
[–]Astrid2448 8 insightful - 1 fun8 insightful - 0 fun9 insightful - 0 fun9 insightful - 1 fun - (1 child)
[–]MezozoicGayoldschool gay 10 insightful - 1 fun10 insightful - 0 fun11 insightful - 0 fun11 insightful - 1 fun - (0 children)
[–]luckystar 3 insightful - 1 fun3 insightful - 0 fun4 insightful - 0 fun4 insightful - 1 fun - (1 child)
[–]reluctant_commenter 1 insightful - 1 fun1 insightful - 0 fun2 insightful - 0 fun2 insightful - 1 fun - (0 children)