<prompt> Translate the following text to EnglishKupungua kwa idadi ya barua za malipo ni sababu ya asilimia 69 ya kupungua kwa idadi ya huduma za posta za kati ya nchi na nchi, ambazo zilikuwa bilioni 3.6 kati ya 1990 na 1997.  <response>: This drop in payment mail volume accounts for 69 percent of the decline in the volume of HH-to-NHH sector, amounted to 3.6 billion pieces between 1990 and 1997 see Table 1. 