Ah that makes sense, thanks. The 'Plausible' analytics link shows the same numbers so the table is not mislabeled, the 18% thing is very likely just a mistake.

Ah that makes sense, thanks. The 'Plausible' analytics link shows the same numbers so the table is not mislabeled, the 18% thing is very likely just a mistake. The number (if we accept all the other assumptions) is a bit under 7%.