Under exceptional circumstances the Chief Statistician may agree for those outputs described in para ii to be pre-announced less than four weeks in advance.
Dan amgylchiadau eithriadol gall y Prif Ystadegydd ganiatáu i’r allbynnau hynny a ddisgrifir ym mharagraff ii gael eu rhag-gyhoeddi lai na phedair wythnos o flaen llaw.