<prompt> Translate the following text to EnglishKwa mfano, katika Marekani, Pato la Taifa kwa kila mtu limekuwa likiongezeka mara mbili kwa mwaka kutoka kizazi kimoja hadi kingine.  <response>: Historically in the United States, GDP per capita has doubled on average from one 35-year generation to the next. 