Sankey diagrams are flow diagrams where the width of the arrows is shown as proportional to the flow quantity. We will use one to understand from where merchandise goods imported into Western European nations originate. Because the number of nations that export to Western European nations is too large to visualize, we will group trade flow by the geographical regions of the exporting nations:
The Since and Until fields in the Time section can be cleared because we will use 2014 as the value in the year column to filter rows in the dataset. Groups of nations can be represented using the value in their exporter_region as the Source field and importer column to represent the Western European nations. In order to only select a Western European country as the Target...