OPEC failed to hold on to its preeminent position, especially after Iran and Iraq went to war in 1980 and caused a further 10% drop in worldwide production – and by 1981, OPEC production was surpassed by other exporters. Additionally, its own member nations were divided among themselves. Saudi Arabia, a "swing producer" trying to gain back market share after 1985, increased production and caused downward pressure on prices, making high-cost oil production facilities less profitable or even unprofitable