Template:Trade unions (dis)established in YYYY category header/doc

This template is used to create a category of one of these two forms: ... where "YYYY" is a 4-digit year.
 * "Trade unions established in YYYY"
 * "Trade unions disestablished in YYYY"

The template detects whether the category is an "establishments" or "disestablishments" category, and adjusts accordingly.

Usage
No parameters needed