<prompt> Translate the following text to EnglishKatika muktadha huu, marejeo katika historia ya kuhitaji kiwango sawa au kuzuia mabadiliko yoyote kwa 1998 inaweza kuwa imeanzishwa kwa dhana kwamba matokeo ya mabadiliko yoyote yangekuwa ongezeko la kiwango.  <response>: In this context, the references in the history to requiring an identical standard or precluding any changes for 1998 may have been based on the assumption that the outcome of any change would be an increase in the standard. 