<prompt> Translate the following text to EnglishMabadiliko hayo yamekuwa na mafanikio makubwa, na uzalishaji wa SO2 kutoka kwa uzalishaji wa umeme umepungua kwa tani milioni 4.5 kutoka viwango vya 1990 na uzalishaji wa NOx chini ya tani milioni 1.5 kutoka viwango vya 1990 karibu tani milioni 3 chini ya ukuaji uliotarajiwa.  <response>: It has been a resounding success, with SO2 emissions from power generation dropping 4.5 million tons from 1990 levels and NOx emissions down 1.5 million tons from 1990 levels about 3 million tons lower than projected growth. 