Here's a post from Anna Brown at the Pew Research Center, "5 Key Findings about LGBT Americans" makes exactly the point I made in my post earlier today.
63% of Americans said in 2016 that homosexuality should be accepted by society, compared with 51% in 2006. LGBT adults recognize the change in attitudes: About nine-in-ten (92%) said in a 2013 Pew Research Center survey of adults identifying as LGBT that society had become more accepting of them in the previous decade.
Perhaps as a result of this growing acceptance, the number of people who identify as LGBT in surveys is also rising.
Yeah, this isn't rocket science.
The rest of the post is well worth the read.