<prompt> Translate the following text to EnglishKwa quintile ya juu, pensheni ni chanzo muhimu zaidi cha mapato kuliko Usalama wa Jamii, lakini pensheni zinawakilisha sehemu ndogo kwa kundi hili kuliko mapato ya mali zilizokusanywa au mapato.  <response>: For the highest quintile, pensions are a more significant income source than Social Security, but pensions represent a smaller share for this group than either income from accumulated assets or earnings. 