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## ITEM 6. SELECTED FINANCIAL DATA 

The following table presents as of, and for the years ended, December 31, selected financial data related to the Company’s financial results for the last five fiscal years. The selected financial data should be read in conjunction with Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations and Item 8. Financial Statements and Supplementary Data. 

For information regarding historical exchange rates, please see Impact of FX on Earnings in Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations. 

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$^{(1)}$ Comparative years' figures have been restated for the retrospective adoption of Accounting Standards Update ("ASU") 2017-07, and the impact on the 2017 and 2016 comparatives are discussed further in Item 8. Financial Statements and Supplementary Data, Note 2 Accounting changes. The restatements of 2015 and 2014 comparatives resulted in a decrease in Operating income of $70 million and $137 million for the years ended December 31, 2015 and 2014, respectively. 

$^{(2)}$ These measures have no standardized meanings prescribed by accounting principles generally accepted in the United States of America ("GAAP") and, therefore, may not be comparable to similar measures presented by other companies. These measures are defined and reconciled in Non-GAAP Measures in Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations. 

$^{(3)}$ Operating ratio is defined as operating expenses divided by revenues. 

