OPEP is a group of 11 DC which produce petroleum: Algeria, Indonesia, Iran, Iraq, Kuwait, Libya, Nigeria, Qatar, Saudi Arabia, United Arab Emirates, Venezuela. These 11 countries represent 41% of oil-production in the world and own more than 75% of known reserves. Founded in September 1960and based in Vienna (Austria), OPEC is in charge of co-ordinating and unifying the petroleum-related policies of its members, with the aim of guaranteeing them all stable revenues. To this end, production is organized on a quota system. Each country, represented by its Minister of Energy and Petroleum, takes a turn in running the organization. Since 1st July 2002, the Venezuelan Alvaro Silva-Calderon is the Secretary General of OPEC.