The occupancy stands, if available, in a readme file which is contained in the zip file of the current font. If there is no readme file, anyway you should contact the author of the current font and ask him, if you can use it for the purpose for what you need it. In the case of a commercial use, you must contact the author of the current font.
You don't know how you can detect the author when there is now readme file? Use our help section.