For a dataset with 250 observations, the top 2% of the losses will be the top 5 observations. Expected shortfall is the average of the losses beyond the VaR threshold. Therefore the correct answer is (20 + 19 + 19 + 17 + 16)/5 = 18.2m .
Note that Expected Shortfall is also called conditional VaR (cVaR), Expected Tail Loss and Tail average.
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