Documentation of statistics: Detailed material flow accounts (physical supply-use tables)
In general it can be assumed that there are less uncertainties associated with data obtained directly from primary statistics, while data that results from estimations and allocations will be associated with more uncertainties.
https://www.dst.dk/en/Statistik/dokumentation/documentationofstatistics/detailed-material-flow-accounts--physical-supply-use-tables-
Documentation of statistics