R1·11111•sf.r Memb<·r Statt-s to make• advance payuwuts towards thl' t·xpt·ns<·s of tlw Organi:.mtion in nmounls not h•iu1 than 80 pn c1·11t of their 11ss1•sst•d <'ontrih11tio11s for thl' ll11:111cial y1•ar t<)(,4, penrling <lnisio11, l,y the Ct·nc•r:il Assc·n1lily on the level of appropriatious and the srale of asst<ssnlC'nts for 1965, and subjel'! to imeh retroactive aclj11st111ents as may tht~n be e:tll<'cl for.