<prompt> Translate the following text to EnglishKwa upande mwingine, sehemu ya jumla ya First Class Mail ilipungua kutoka asilimia 8.1 mwaka 1990 hadi asilimia 6.4.  <response>: Finally, its share of total First-Class Mail dropped from 8.1 percent in 1990 to 6.4 percent in 1997. 