There's two ways to count things. You can measure total consumption, or consumption per capita (per person). If the group of 100 people eats 1000 tacos, you could report it as 1000 tacos eaten, or 10 tacos eaten per capita.

The later is more useful when comparing between groups of different sizes. The US likely consumes more total tacos than Norway, just because the population is so much larger. If we adjust for the size of the population (divide the total by the population size), Norway may be higher —if we assume the OP is correct and this is what they meant.