Humanity is take one by one into a time stopped white room to vote red or blue. You do not know what # you are, but you can see the % of humanity that has already voted blue. It is 21.35%

You are taken into a white room, where there is nothing but a red and a blue button. A disembodied voice explains it to you; It's the classic problem, if greater than 50% of humanity presses blue, everyone survives, if greater than 50% press red, only the red pressers survive. The entity then explains that he has taken humanity, one by one, into a white room. Time has stopped for the rest of the universe, so even though he is collecting votes one by one, this will happen in the blink of an eye for the rest of humanity and everyone will be taken from the earth and returned at the exact same instant. The entity will not tell what # you are and how many have gone before you, but he will say that 21.35% of all of humanity (including people who both have and haven't voted yet) have voted blue.

What do you do?