The amount of debt for selected countries in 2013 is given in the table below (“trn” means trillions):

Country                                Debt
Britain..............................£1.4 trn
Canada...................1.2 $CDN trn
Japan........................10.5 $US trn
United States..........17.6 $US trn

In what way do you need to transform these data before making a chart that compares debt among the four countries? Do not make the chart, but say what type of chart you would use and provide a reason.