With the largest population in Africa, Nigeria's political and economic developments reverberate across the continent. Nigeria chairs the Economic Community of West African States (ECOWAS) and is the eighth largest oil exporting country in the world. More than 40 percent of the region's gross domestic product is accounted for by Nigeria's economy, and the petroleum industry is responsible for about two-thirds of national revenue and a great deal of international interest in the country. Yet the government maintains a delicate hold on democracy, and the country has recently experienced political instability. Throughout 2006, militant rebels angry about the distribution of oil revenue have conducted a series of attacks against the industry, including kidnapping foreign workers, which resulted in the country's petroleum output dropping by 25 percent.