Final answer:
The list of over-manned ratings by zone is updated every quarter, reflecting any changes in demand for certain ratings.
Step-by-step explanation:
The list of over-manned ratings by zone is updated every quarter.
This means that every three months, a new update is released that reflects any changes in the over-manned ratings for each zone.
For example, if a rating was previously considered over-manned but the demand for that rating decreased, it may be removed from the list in the next update.