While i was growing up in the 80's and 90's and always heard banded around that 10% of the population is gay or bi. But i'm starting to think while they're making more noise than ever i think 10% is an over-exaggeration. I did see one report say it was only about 3%. In my building we're over 3500 people and they held a pride event and only about 100 people turned up. And most of those were straight people turning up to support.
And my multinational company of 66k employess has 15% identifying as LGBT.
There will obviously be swings for different industries, media, travel and leisure are likely to have a higher percentage than others.