Renewable energy in Brazil accounted for more than 85.4% of the domestically produced electricity used in Brazil, according to data from the 2009 National Energy Balance, conducted by the Energy Research Corporation (EPE). After the oil shocks of the 1970s, Brazil started focusing on developing alternative sources of energy, mainly sugarcane ethanol. Its large sugarcane farms helped. In 1985, 91% of cars produced that year ran on sugarcane ethanol. The success of flexible-fuel vehicles, introduced in 2003, together with the mandatory E25 blend throughout the country, have allowed ethanol fuel consumption in the country to achieve a 50% market share of the gasoline-powered fleet by February 2008.