Considering the European average as a base, how did countries evolve economically in the past few years?

Measuring the GDP per inhabitant evolution, using 2012 and 2018 numbers to grasp variations. These EU-27 figures are based on an average set at 100 for both years (Source: Eurostat).

GDP per inhabitant from 2012 to 2018 (positive evolution to average in blue, negative in red).
As was intended by Brussels & Member States, Eastern Europe has caught up with Western or Northern Europe, though economic indicators continue to display significant salary and production gaps between West and East. Of note, Ireland, Spain and Portugal were also closer to the EU average in 2018 than they were in 2012. This does not mean that Northern and Western Europe have declined: their economies have also progressed in that period, but they have progressed at a lesser rhythm than countries who appear in blue.