The regional aggregate includes an "unallocated" category that represents 2-5% of the total, but its composition isn't documented. This black hole makes it hard to assess data quality and impossible to reconcile with component-level totals. Should we either break down the unallocated category or exclude it from the aggregate?

Missing Poland data after 2002 (edited to fix a unit)

The proportions don't align with the marginal totals. Is there a rounding artifact somewhere?