Easy to renew NHSC loan repayment?

For those who are or have been involved in the NHSC loan repayment program, how difficult or easy is it to renew? They were very vague with me about how they decide to renew and whether or not this continued to rely upon your site score or whether you were competing with other applicants initially applying? Or whether it is a given that if you remain at your current site that you will be renewed.

Any ideas on this? I did receive the initial 50k for 2-years of service for my site, which...

Easy to renew NHSC loan repayment?