<prompt> Translate the following text to EnglishTabla ya 2 na picha ya 1 inaonyesha kwamba kadiri kiasi cha posta kinavyoongezeka kwa kila mtu, kiasi cha usindikaji wa barua katika gharama ya jumla kitaongezeka na kiasi cha utoaji kitapungua.  <response>: Postal Service costs from Table 2, Figure 1 shows that as per capita volume increases, the mail processing proportion of total cost will increase and the delivery proportion will decrease. 