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