With only 5 percent of the world's population,United States citizens consume 28 percent of its nonrenewable resources, drive more than one-third 0f its automobiles, and use 21 times more water per capita than Europeans do.
I think this one is idiomatic. If you have two cakes in the room, you don't say "The cake on the left has 50% of the cakes in this room." Instead, you say "The cake on the left accounts for 50% of the cakes in this room."