Methodology 30 countries questioned across 5 continents, a representative sample of 2/3 o f t h e w o r l d' s p o p u l' a t i o n... a representative sample of 2/3 o f t h e w o r l d' s p o p u l' a t i o n. To t a l s' a m p l' e o f 2 4, 0 1 7 individuals; Representative of the population aged 16 and over in each country; 500.