NEW YORK (AP) — Female CEOs are outpacing their male colleagues in pay, although they remain vastly outnumbered in the top echelons of American companies. Last year, the median pay for women CEOs rose to $15.9 million, a 21 percent gain from a year earlier, according to a study by executive compensation data firm Equilar and The Associated Press. For 2014, the board decided it was time to raise the salary portion of her pay package to make it consistent with her peers at similar technology companies. PepsiCo., which makes Frito-Lay snacks, Gatorade sports drinks and Quaker oatmeal, has improved its performance by raising prices and slashing costs. The company's earnings were hit this year by currency volatility in countries like Russia and Bolivia, but this was offset by growth at Frito-Lay North America, which makes snacks such as Doritos, Cheetos and Tostitos. Novakovic was a senior executive at General Dynamics for more than a decade before she was promoted to the top job in January 2013. Since she took the position, the defense contractor's stock has doubled as it has increased dividend payouts and boosted stock buybacks. Woertz's near nine-year tenure as CEO of Archer Daniels Midland ended in December, though she still holds the position of chairman at the company, which makes vegetable oil, ethanol and ingredients used in packaged foods and drinks. The maker of Oreo cookies, Cadbury chocolate and Trident gum raised Rosenfeld's overall pay by 14 percent last year. [...] the fight showed that DuPont needed to do a better job of explaining its transformation from a traditional chemical maker to a faster-growing company focused on agricultural products and advanced materials, she said.