<prompt> Translate the following text to SwahiliIn 1997, households originated only 16 percent of First-Class mail, down from 23 percent in 1990.  <response>: Katika mwaka wa 1997, asilimia 16 tu ya barua za darasa la kwanza zilitoka kwa kaya, chini ya asilimia 23 katika mwaka wa 1990. 