<prompt> Translate the following text to EnglishTangu miaka ya 1960, uhifadhi wa jumla wa kitaifa wa Marekani kama sehemu ya Pato la Taifa umekuwa wa sita kati ya kikundi cha nchi saba kuu za viwanda - G7.  <response>: Since the 1960s, U.S. gross national saving as a share of GDP has ranked sixth among a group of seven major industrialized countries- the G-7. 