Portal Year Era

The current era. For more information, see:
 * Portal Year 10
 * Portal Year 11
 * Portal Year 12
 * Portal Year 13
 * Portal Year 14
 * Portal Year 15
 * Portal Year 16
 * Portal Year 17
 * Portal Year 18
 * Portal Year 19
 * Portal Year 20
 * Portal Year 21
 * Portal Year 22