<prompt> Translate the following text to EnglishKwa mujibu wa orodha ya viwanda vya umeme, ikiwa upanuzi wa mifumo ya FGD, SCR na ACI kwa mwaka 2005 utafanyika zaidi ya miezi 31 kabla ya 2005 na zaidi ya kipindi cha miaka mitatu kwa kila ongezeko la miaka mitano baada ya 2005 hadi 2020, mahitaji ya juu yatakuwa karibu 23 ya watengenezaji wa boiler ya msafara au karibu 19 kwa msafara na wanafunzi pamoja.  <response>: According to Table 6-4, if the retrofit of the FGD, SCR, and ACI systems for 2005 occur over thirty-one months prior to 2005 and over a three-year period for each five-year increment after 2005 to 2020, the maximum demand would be about 23 percent of the journeyman boilermakers or about 19 percent for journeymen and apprentices combined. 