An important question is whether such a pace can be sustained over the next decade. The previous section noted that in some states, actual yields were not far from their potential, realisable level, while in other states a considerable gap remains. Further, some neighbouring countries have higher yields, and it appears that sustaining high yield growth may well be possible. This Outlook is optimistic in assuming the yield growth will remain robust over the next decade, particular if the current policy set remains in place (see discussion below).