<prompt> Translate the following text to EnglishSerikali inatumia matokeo ya tathmini ya Oktoba 1997 hadi Septemba 1998 kama msingi ambao matokeo ya tathmini za baadaye hupimwa.  <response>: The government uses the October 1997 through September 1998 review results as a baseline against which the results of subsequent reviews are measured. 