BP plc (stylised as bp), formerly British Petroleum, is a British multinational oil and gas company headquartered in London, England. It is one of the world's seven oil and gas "supermajors", whose performance in 2012 made it the world's sixth-largest oil and gas company, the sixth-largest energy company by market capitalization and the company with the world's 12th-largest revenue (turnover). It is a vertically integrated company operating in all areas of the oil and gas industry, including exploration and production, refining, distribution and marketing, petrochemicals, power generation and trading. It also has renewable energy interests in biofuels and wind power. As of 31 December 2017, BP had operations in 70 countries worldwide, produced around 3.6 million barrels per day (570,000 m3/d) of oil equivalent, and had total proved reserves of 18.441 billion barrels (2.9319×109 m3) of oil equivalent. The company has around 18,300 service stations worldwide. Its largest division is BP America in the United States. In Russia, BP owns a 19.75% stake in Rosneft, the world's largest publicly traded oil and gas company by hydrocarbon reserves and production. BP has a primary listing on the London Stock Exchange and is a constituent of the FTSE 100 Index. It has secondary listings on the Frankfurt Stock Exchange and the New York Stock Exchange.