Coca-Cola’s quarterly profit fell 8 percent. Overall volume was down 1 percent in North America, the Atlanta company’s top market, and volume for soft drinks — the biggest share of its products — fell 3 percent. The news comes as Americans seek to cut back on sugary drinks as well as their diet versions. Net income fell to $1.71 billion from a year earlier. Earnings per share fell from 41 cents per share in the fourth quarter of 2012 to 38 cents. Coke said it’s looking abroad for growth.