['Hong Kong —0.1%. Ronnie Chua/Shutterstock.', 'Brunei — 3.1%. Sultan Omar Ali Saifuddien Mosque, Brunei. ... ', 'Estonia — 9.5%. GuilhermeMesquita/Shutterstock. ... ', 'Saudi Arabia — 12.4%. ... ', 'Botswana — 13.9%. ... ', 'Russia — 17%. ... ', 'Kuwait — 18.6%. ... ', 'Nigeria —18.6%. ... ']