EEA standard re-use policy: unless otherwise indicated, re-use of content on the EEA website for commercial or non-commercial purposes is permitted free of charge, provided that the source is acknowledged (http://www.eea.europa.eu/legal/copyright). Copyright holder: European Environment Agency (EEA).
Therefore, as a provisional solution, a conventional time period of 10 years has been set between the two databases. It could be used as well, an average European time span, weighted or not by country surface.
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