Released every year.
Released 4 times a year.
Released every month.
Released every five years.
Released every ten years.
Every other year.
Twice a year.
Every 3 years.
Every 4 years.
Programs will conduct surveys as they are asked, or budget allows.
Some surveys are/will be conducted within a range, for example, every 2-3 years.
A survey that was released one time.