Expenditure shares may not sum due to rounding.

The implementation of the double update in 2017 means that for 2017, 2018 and 2019, there are two sets of weights produced for these years, one for January, and one for February to December. For consistency with previous years, we compare only the January weights in this analysis. For example, when we take the average of the weights across the period 2005 to 2018, we only include the weights for January 2018 in this average. For more information about the double update, please see the Methodology article.