Use this to retrieve the area (BP total) of a stage. The first parameter is the stage's name. If you provide a second parameter, it'll return its ranking in the size table (so "1st" for the largest area, "2nd" for the second largest, etc.)
With this template, there is no need to update several articles at once just because one stage got added or had its area changed. To edit a stage's ranking or total area amount, edit this template. It should be intuitive.