Template:US insular area sports year category/doc

This template is used to create by-year categories for sports in one of the insular areas of the United States,

e.g. Category:1968 in Puerto Rican sports.

Adds portal box, category explanation, navbox, and parent categories:

Usage
No parameters are needed. The template parses the pagename, and extracts from it the year and name of the insular area.

Error-checking
The template checks that the page:
 * 1) is a category
 * 2) has a title of the form "YYYY in Fooian sports"
 * 3) That "Fooian" is one of:
 * 4) * Guamanian
 * 5) * Puerto Rican
 * 6) * Northern Mariana Islands
 * 7) * United States Virgin Islands

If any of those conditions is not met, an error message is displayed and no other output is generated, but the page is added to a tracking category: Note that this tracking page is shared with other category header templates)
 * Category:Errors reported by other category header templates (population: pages)