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The database was developed and analysed in three consecutive EU projects: EXIOPOL \cite{Tukker_2013}, CREEA \cite{Wood_2014} and the ongoing project DESIRE. The currently available version, EXIOBASE 2, implements the  economic and environmental accounting principles proposed in the UN System of  Economic and Environmental Accounts \cite{european_commission._system_2014}. \cite{european_commission_system_2014}.  The ongoing development of EXIOBASE 3 concentrates on providing a time series  of EE MRIOs and now-casting this time series to the current year.