<prompt> Translate the following text to EnglishUokoaji wa kitaifa ni nini na jinsi uokoaji wa sasa nchini Marekani unalinganishwa na mwenendo wa kihistoria na uokoaji katika nchi nyingine?  <response>: 2 What is national saving and how does current saving in the United States compare to historical trends and saving in other countries? 