It's okay for you to just say you don't know. You don't have to be extra unhelpful. As previously as stated, I have searched and have not been able to find a specific figure, specifically as a solid number or % of global population. If you cannot find a source to link me that's okay, but tell me to search for it myself when I have told you I have already done so is rude. I didn't expect you to have a source, I was just hoping you did.