How to set up training that needs to be repeated annually

Summary

What is the best way to set up training that needs to be repeated annually?

Content

Hi

Please can you advise me on the best way to set up courses that need to be repeated annually? 

We've set up the course details so it expires after 12 months.  Do we then need to set up a new offering for each year?

Do we need to manually re-enrol staff onto that offering, or will they be able to see it to enrol themselves after the expiry period.

Or, it is better to create an entirely new course for each year?

Many thanks