<prompt> Translate the following text to EnglishIli kutoa makadirio ya kihafidhina ya rasilimali zinazohitajika, uchambuzi unaofuata unaangalia kutekeleza marekebisho ya 2005 katika miezi 31 kabla ya 2005 na marekebisho ya 2010, 2015 na 2020 miaka mitatu kabla ya kila kipindi cha miaka mitano.  <response>: To provide a conservative estimate of required resources, the following analysis looks at implementing the retrofits for 2005 in 31 months prior to 2005 and retrofits for 2010, 2015, and 2020 three years prior to each five-year period. 