<prompt> Translate the following text to SwahiliNevertheless, the authors cannot explain why Portugals percentage of mail processing cost is so low in comparison to the other posts in the sample.  <response>: Hata hivyo, waandishi hawawezi kueleza kwa nini asilimia ya Ureno ya gharama ya usindikaji wa barua ni chini sana ikilinganishwa na posts nyingine katika sampuli. 