Standard Outputs were recalculated for the period 2008-2012 (referred to as 2010 SOs) and have now been recalculated for 2018-19 onwards (referred to as 2013 SOs).
Ailgyfrifwyd Allbynnau Safonol ar gyfer y cyfnod 2008-2012 (y cyfeirir atynt fel SO 2010) ac maent bellach wedi'u hailgyfrifo ar gyfer 2018-19 ymlaen (y cyfeirir atynt fel SO 2013).