<prompt> Translate the following text to EnglishGAO imesitawi kwa miaka mingi, lakini sasa ina jukumu la kusaidia Bunge kutimiza majukumu yake ya kikatiba na kusaidia kuboresha utendaji na uwajibikaji wa serikali ya shirikisho kwa faida ya watu wa Amerika.  <response>: While GAO has evolved over the years, its current mission is GAO exists to support the Congress in meeting its constitutional responsibilities and to help improve the performance and accountability of the federal government for the benefit of the American people. 