We therefore revert to the simpler method to linearly interpolate values of the CVs in the years between surveys. The main drawback of this modelling choice is that, when the last available survey dates several years back, the value of the CV is kept constant. In such cases, changes over time in the ability to access food by different strata of the population that are not fully reflected in changes in the average national food consumption, are not reflected in PoU estimates. To generate national-level three-year averages for 2015-17 and annual values at regional and global level in 2017, projections are needed.