<prompt> Translate the following text to SwahiliR97-1, referring to period 1977-95, Postal Service volume witness Tolley first observed that the general trend has been a decrease in the share of First-Class letters sent by households and an increase in the share sent by non-households.  <response>: R. 97-1 - Kuhusu kipindi cha 1977-1995, Postal Service Volume Shahidi Tolley kwanza aliona kwamba mwelekeo wa jumla imekuwa kupungua kwa sehemu ya barua ya darasa la kwanza kutumwa na kaya na ongezeko katika sehemu kutumwa na si-familia. 