Up vs Down

The entire world pauses. Everyone in the world is instantly spiritually projected into their own private room no matter if they are a baby, in a coma, or paralyzed. Every person must cast a vote, their spiritual projection is capable of making the vote even if they are unaware of what that vote means. There are absolutely no exceptions.

The room has an Up button and a Down button. You are told that voting starts at 0 and that everyone in the world will be voting. The Up arrow increases the running count by 1, the down arrow decreases the running count by 1. Everyone in the world lives if the number by the end is greater than 0. If the number is 0 or less than 0 then only people who pressed the down arrow will live and all who pressed up will die. You do not get to see the running count until after you vote and you cannot communicate to others what you see.

Once all votes are cast, you return to your body and the world resumes. If people have died based on the results of the vote, they die immediately. Do you vote up or down?