How Many D&D Players Are There Worldwide?

I've been playing D&D for a long time. But apparently, I'm not the only one. There is an ever growing number of Dungeons & Dragons players out there. But, how many D&D players are there worldwide? 

The popular tabletop game known as Dungeon & Dragons has been

Why is World of Darkness the RPG less popular than D&D? - Quora

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How many people play D&D? - Quora

How many people in the world play Dungeons & Dragons? - Quora

How Many D&D Players Are There Worldwide?

The popular tabletop game known as Dungeon & Dragons has been

How many people in the world play Dungeons & Dragons? - Quora

Encouraging Shy D&D Players