The following visualization was first drafted in Tableau and later finalized in D3. This link shows a dot for each year for 12 region that depends in size on the sum of the number of attacks and each dot is colored by the number of individuals killed. The bigger the dot, the more attacks happened. The redder the dot, the more number of individuals that got killed. In the updated version an interactive tooltip is added that shows for each dot the exact number of attacks and the number of individuals killed. The visualization clearly shows that between 2005 and 2010 in the Middle East and North Afrika many deadly attacks happened.
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Data Visualization Blog KU Leuven 