The Organization of the Petroleum Exporting Countries (OPEC) is a permanent, intergovernmental Organization, created at the Baghdad Conference on September 1014, 1960, by Iran, Iraq, Kuwait, Saudi Arabia and Venezuela. The five Founding Members were later joined by: Qatar (1961) terminated its membership in January 2019; Indonesia (1962) suspended its membership in January 2009, reactivated it in January 2016, but decided to suspend it again in November 2016; Libya (1962); United Arab Emirates (1967); Algeria (1969); Nigeria (1971); Ecuador (1973) suspended its membership in December 1992, reactivated it in October 2007, but decided to withdraw its membership effective 1 January 2020; Angola (2007); Gabon (1975) - terminated its membership in January 1995 but rejoined in July 2016; Equatorial Guinea (2017); and Congo (2018). OPEC had its headquarters in Geneva, Switzerland, in the first five years of its existence. This was moved to Vienna, Austria, on September 1, 1965. OPEC's objective is to co-ordinate and unify petroleum policies among Member Countries, in order to secure fair and stable prices for petroleum producers; an efficient, economic and regular supply of petroleum to consuming nations; and a fair return on capital to those investing in the industry. The 1960s OPECs formation by five oil-producing developing countries in Baghdad in September 1960 occurred at a time of transition in the international economic and political landscape, with extensive decolonisation and the birth of many new independent states in the developing world. The international oil market was dominated by the Seven Sisters multinational companies and was largely separate from that of the former Soviet Union (FSU) and other centrally planned economies (CPEs). OPEC developed its collective vision, set up its objectives and established its Secretariat, first in Geneva and then, in 1965, in Vienna. It adopted a Declaratory Statement of Petroleum Policy in Member Countries in 1968, which emphasised the inalienable right of all countries to exercise permanent sovereignty over their natural resources in the interest of their national development. Membership grew to ten by 1969. The 1970s OPEC rose to international prominence during this decade, as its Member Countries took control of their domestic petroleum industries and acquired a major say in the pricing of crude oil on world markets. On two occasions, oil prices rose steeply in a volatile market, triggered by the Arab oil embargo in 1973 and the outbreak of the Iranian Revolution in 1979. OPEC broadened its mandate with the first Summit of Heads of State and Government in Algiers in 1975, which addressed the plight of the poorer nations and called for a new era of cooperation in international relations, in the interests of world economic development and stability. This led to the establishment of the OPEC Fund for International Development in 1976. Member Countries embarked on ambitious socio-economic development schemes. Membership grew to 13 by 1975. The 1980s After reaching record levels early in the decade, prices began to weaken, before crashing in 1986, responding to a big oil glut and consumer shift away from this hydrocarbon. OPECs share of the smaller oil market fell heavily and its total petroleum revenue dropped below a third of earlier peaks, causing severe economic hardship for many Member Countries. Prices rallied in the final part of the decade, but to around half the levels of the early part, and OPECs share of newly growing world output began to recover. This was supported by OPEC introducing a group production ceiling divided among Member Countries and a Reference Basket for pricing, as well as significant progress with OPEC/non-OPEC dialogue and cooperation, seen as essential for market stability and reasonable prices. Environmental issues emerged on the international energy agenda. The 1990s Prices moved less dramatically than in the 1970s and 1980s, and timely OPEC action reduced the market impact of Middle East hostilities in 1990 91. But excessive volatility and general price weakness dominated the decade, and the South-East Asian economic downturn and mild Northern Hemisphere winter of 1998 99 saw prices back at 1986 levels. However, a solid recovery followed in a more integrated oil market, which was adjusting to the post-Soviet world, greater regionalism, globalisation, the communications revolution and other high-tech trends. Breakthroughs in producer-consumer dialogue matched continued advances in OPEC/non-OPEC relations. As the United Nations-sponsored climate change negotiations gathered momentum, after the Earth Summit of 1992, OPEC sought fairness, balance and realism in the treatment of oil supply. One country left OPEC, while another suspended its Membership. The 2000s An innovative OPEC oil price band mechanism helped strengthen and stabilise crude prices in the early years of the decade. But a combination of market forces, speculation and other factors transformed the situation in 2004, pushing up prices and increasing volatility in a well-supplied crude market. Oil was used increasingly as an asset class. Prices soared to record levels in mid-2008, before collapsing in the emerging global financial turmoil and economic recession. OPEC became prominent in supporting the oil sector, as part of global efforts to address the economic crisis. OPEC s second and third summits in Caracas and Riyadh in 2000 and 2007 established stable energy markets, sustainable development and the environment as three guiding themes, and it adopted a comprehensive long-term strategy in 2005. One country joined OPEC, another reactivated its Membership and a third suspended it. 2010 until now The global economy represented the main risk to the oil market early in the decade, as global macroeconomic uncertainties and heightened risks surrounding the international financial system weighed on economies. Escalating social unrest in many parts of the world affected both supply and demand throughout the first half of the decade, although the market remained relatively balanced. Prices were stable between 2011 and mid-2014, before a combination of speculation and oversupply caused them to fall in 2014. Trade patterns continued to shift, with demand growing further in Asian countries and generally shrinking in the OECD. The world s focus on multilateral environmental matters began to sharpen, with expectations for a new UN-led climate change agreement. OPEC continued to seek stability in the market, and looked to further enhance its dialogue and cooperation with consumers, and non-OPEC producers.