Funnily enough, back in 2013 I looked at some studies and made my own guess that for men, the percent who would would say they were gay or bisexual was probably 4 to 5%. And what do you know - the Gallop poll shows that 4.5% of all Americans are now claiming to be LGBT. But, there are fewer men than women in that figure:
Overall, 5.1% of women in 2017 identified as LGBT, compared with 3.9% of men. The change among men over time has been minimal, with the LGBT percentage edging up from 3.4% in 2012 to 3.7% both last year and this year. On the other hand, the percentage of women identifying as LGBT has risen from 3.5% in 2012 to 5.1% today, with the largest jump occurring between 2016 and 2017.Still, my spitball estimate seems pretty close.
Anyway, the biggest feature of these figures is the very big growth in young people identifying this way. Look at the table:
You would have to strongly suspect that the increase in millenials identifying as such says more about their susceptibility to experimentation and social fashion than a settled view of their own sexuality. (I mean, if it was a case of social mores meaning more people are happy to come out, you would expect some growth in the numbers of older folk identifying, but it's just not there.)
It certainly indicates that the Catholic Church is just going to continue to be bypassed in influence in the matter of its teaching on sexuality.