<prompt> Translate the following text to SwahiliFinally, Columns 5, 8, and 11, labeled Annual Growth show the annual volume growth rates of all sectors and total First-Class Mail for the time periods 1987-90, 1990-93 and 1993-97, respectively.  <response>: Mstari wa 5 na 8 unaonyesha Kukua kwa kila mwaka na Kukua kwa kila mwaka kwa idadi ya barua za kila mwaka kwa kipindi cha miaka ya 1987-90, 1990-93 na 1993-97. 