Ms Jasmina Behan:

I will respond and perhaps refer to my colleagues from the Department of Finance, who do modelling and forecasting, to speak to that. On the question of whether to backcast or forecast, both approaches have errors. The historical data are usually used as a predictor, so they are typically part of the forecasting anyway. It is also about the fact that if we forecast and use that to calculate the rate, if the forecast proves to be wrong and there is a correction to the individual in terms of their payment, that impacts on the uncertainty. It increases an uncertainty which, I suppose, the indexation benchmark is probably trying to remove. In terms of whether we do, perhaps my colleagues from the Department of Finance might talk about their forecasting.