The 1979 (or second) oil crisis in the United States occurred in the wake of the Iranian Revolution. Amid massive protests, the Shah of Iran, Mohammad Reza Pahlavi, fled his country in early 1979, allowing the Ayatollah Khomeini to gain control. The protests shattered the Iranian oil sector. While the new regime resumed oil exports, it was inconsistent and at a lower volume, forcing prices to go up. Saudi Arabia and other OPEC nations, under the presidency of Dr. Mana Alotaiba increased production to offset the decline, and the overall loss in production was about 4 percent. However, a widespread panic resulted, driving the price far higher than would be expected under normal circumstances. In 1980, following the Iraqi invasion of Iran, oil production in Iran nearly stopped, and Iraq's oil production was severely cut as well. After 1980, oil prices began a six-year decline that culminated with a 46 percent price drop in 1986. This was due to reduced demand and over-production, which caused OPEC to lose its unity. Oil exporters such as Mexico, Nigeria, and Venezuela expanded production.