<prompt> Translate the following text to SwahiliIn the last two Fiscal Years, 1997 and 1998, Standard A mail grew at an average annual rate of 7.5 percent, five times higher than First-Class Mail.  <response>: Katika miaka miwili ya mwisho ya kifedha, 1997 na 1998, barua ya kawaida ilikua kwa kiwango cha wastani cha kila mwaka cha 7.5, mara tano zaidi ya barua ya darasa la kwanza. 