<prompt> Translate the following text to EnglishKwa sababu dhana zetu za mfano zinategemea makadirio ya bajeti ya sasa na makadirio ya hivi karibuni ya muda mrefu ya akuta ya Usalama wa Jamii na Medicare, dhana zetu za sasa za mfano hutofautiana kidogo na zile zilizotumiwa katika ripoti zetu za awali.  <response>: Because our model assumptions are based on current budget projections and recent long-term actuarial projections for Social Security and Medicare, our current model assumptions differ somewhat from those used in our earlier reports. 