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Consolidated Statements of Income (Unaudited) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Operating revenues (a) | [1] | $ 19,584 | $ 25,118 | $ 35,298 | $ 46,448
Costs and expenses: |  |  |  |  |
Cost of sales (excluding the lower of cost or market inventory valuation adjustment) |  | 17,120 | 21,394 | 30,627 | 39,557
Lower of cost or market inventory valuation adjustment |  | (454) | 0 | (747) | 0
Operating expenses |  | 1,001 | 1,043 | 2,031 | 2,127
General and administrative expenses |  | 159 | 178 | 315 | 325
Depreciation and amortization expense |  | 471 | 425 | 956 | 866
Asset impairment loss |  | 56 | 0 | 56 | 0
Total costs and expenses |  | 18,353 | 23,040 | 33,238 | 42,875
Operating income |  | 1,231 | 2,078 | 2,060 | 3,573
Other income, net |  | 14 | 8 | 23 | 32
Interest and debt expense, net of capitalized interest |  | (111) | (113) | (219) | (214)
Income before income tax expense |  | 1,134 | 1,973 | 1,864 | 3,391
Income tax expense |  | 291 | 608 | 508 | 1,058
Net income |  | 843 | 1,365 | 1,356 | 2,333
Less: Net income attributable to noncontrolling interests |  | 29 | 14 | 47 | 18
Net income attributable to Valero Energy Corporation stockholders |  | $ 814 | $ 1,351 | $ 1,309 | $ 2,315
Earnings per common share |  | $ 1.74 | $ 2.67 | $ 2.79 | $ 4.53
Weighted-average common shares outstanding (in millions) |  | 467 | 505 | 468 | 509
Earnings per common share – assuming dilution |  | $ 1.73 | $ 2.66 | $ 2.78 | $ 4.52
Weighted-average common shares outstanding – assuming dilution (in millions) |  | 470 | 508 | 471 | 512
Dividends per common share |  | $ 0.60 | $ 0.40 | $ 1.20 | $ 0.80
[1] | Includes excise taxes on sales by certain of our international operations of $1,470 million and $1,513 million for the three months ended June 30, 2016 and 2015, respectively, and $2,865 million and $2,939 million for the six months ended June 30, 2016 and 2015, respectively.

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