<prompt> Translate the following text to SwahiliThe Congressional Budget Office CBO describes its projections as more tentative than usual because the increase in CBOs productivity growth assumption is based on data only for the past few years.  <response>: Ofisi ya Bajeti ya Bunge CBO inaelezea makadirio yake kama ya muda kuliko kawaida kwa sababu ongezeko la uvumbuzi wa CBO inategemea data tu kwa miaka michache iliyopita. 