Data from the International Tanker Owners Pollution Federation Limited (www.itopf.com) give the cause of spillage for small and large oil tanker accidents for 1970–2013. Draw a graph comparing the causes of small spills with the causes of large spills. Give a reason for your choice of graph and write a short report (40–80 words) comparing the causes of the different sizes of spills.

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Number of Spills From Oil Tankers 1970–2013 Number of Large Spills > 700 tonnes Number of Small Spills < 7 tonnes Collision 185 136 Grounding 240 150 576 Hull Failure 60 1682 Equipment Failure 18 52 Fire/Explosion Other 173 1812 29 3179 Unknown 14 Total 7847 459