The normalization layer is usually where 80% of the effort goes. Official sources often publish the same metric in 3-4 slightly different formats depending on the year or reporting entity, and reconciling those is tedious but essential before any comparison is meaningful.

What's your strategy for handling revisions? Government data sources frequently publish corrections 3-6 months after initial release, and keeping historical snapshots vs. always-current figures becomes a real design choice.

GDP growth is stagnant compared to peers. If that trend continues or intensifies, don't you think it will impact the other moment-in-time stats?

A question for you. Did you built it, just for fun to compare EU vs the world or is there some insight that you are trying to share ?

forget to add one stat. Europe is the place where both World War I and World War II started.