<prompt> Translate the following text to SwahiliU.S. historical standards, U.S. gross national saving has generally been lower than other major industrialized countries over the past 4 decades see figure 2.3.  <response>: Kwa mujibu wa viwango vya kihistoria vya Marekani, uhifadhi wa jumla wa kitaifa wa Marekani umekuwa chini kuliko nchi nyingine kubwa za viwanda katika miongo minne iliyopita tazama mchoro 2.3. 