<prompt> Translate the following text to EnglishTakwimu za NIPA zilizotolewa katika ripoti hii zinaonyesha mabadiliko yaliyofanywa katika marekebisho ya jumla ya kumi na moja ya akaunti za kitaifa mnamo 1999, ikiwa ni pamoja na kuorodheshwa upya kwa ununuzi wa programu kama uwekezaji, ambayo inajadiliwa katika Q2.  <response>: The NIPA data presented throughout this report reflect changes made in the 11th comprehensive revision of the national accounts in 1999, including the reclassification of software purchases as investment, which is discussed in Q2. 