To improve the structural design of oil tankers with the objective of reducing the likelihood of an oil spill and decreasing the amount of outflow in the event of a hull puncture, a study reported the spillage amount and cause of puncture for 50 recent major oil spills from tankers and carriers. The data are displayed in both a bar and pie chart, given below. Interpret what the displays show. Is a pie chart an appropriate display for these data? Why or why not?