Which countries are included in the aggregated European Union data series?
A. The historical aggregated data for the European Union (EU) are updated to include all current EU member countries at the time of publication. For example, when the EU-25 became EU-27 in 2007, all historical and projected data were recalculated to reflect 27 member countries. This methodology ensures that the time series reflect changes in economic conditions and not changes in the country group composition.