<prompt> Translate the following text to EnglishKwa mujibu wa sheria za nchi, mapato ya kila mtu yanapaswa kutegemea mapato ya kila mtu, kulingana na kanuni zilizoelezwa katika nyongeza ya H ya Ripoti ya Utaratibu wa Sehemu ya 812 kwa Bunge EPA 1999.  <response>: To estimate the effects of changes in income over time we use a procedure originally outlined in Appendix H of the Section 812 Prospective Report to Congress EPA 1999. 