How often is UCUES administered?

UCUES is currently administered once every two years (even numbered years) at each of the UC undergraduate campuses. However, for approximately ten years (i.e., 2002-2012) UCUES was administered annually at UC Berkeley. Earlier versions of UCUES date back to 1997 (aggregate results for all available UCUES years can be found on the UC Undergraduate Experience Survey (UCUES) webpage).