Argentina’s state-owned oil company YPF SA expects shale oil and gas production to grow 35% in 2018, as costs in the Vaca Muerta shale play continue to fall, Chief Financial Officer Daniel Gonzalez said. Still, declining production in mature fields means overall hydrocarbon output will fall 2 to 3% in 2018 after a 5.3% reduction in 2017, Chairman Miguel Gutierrez said.