gasoline. Between 1981 and 2010, domestic consumption of oil products increased from to —an average annual growth rate of 3.7 percent. Between 1981 and 2004, consumption of gasoline grew by 6 percent annually, but domestic production met only 75 percent of demand for this product. In 2004 the country imported US$1.6 billion worth of gasoline. By 2006 it imported 41 percent of its gasoline, but by 2010 imports were down to 19.5% of gasoline consumption and heavy investment in new refining capacity may see Iran exporting gasoline by 2015. Refining capacity increased 18% in 2010 and the target is to increase refining capacity to 3.5 million barrels per day. Trade in oil and oil products In 2006 exports of crude oil totaled , or about 62.5 percent of the country's crude oil production. The direction of crude oil exports changed after the Revolution because of the U.S. trade embargo on Iran and the marketing strategy of the NIOC. Initially, Iran's post-revolutionary crude oil export policy was based on foreign currency requirements and the need for long-term preservation of the natural resource. In addition, the government expanded oil trade with other developing countries. While the shares of Europe, Japan, and the United States declined from an average of 87 percent of oil exports before the Revolution to 52 percent in the early 2000s, the share of exports to East Asia (excluding Japan) increased significantly. In addition to crude oil exports, Iran exports oil products. In 2006 it exported of oil products, or about 21 percent of its total oil product output. Iran plans to invest a total of $500 billion in the oil sector before 2025. In 2010, Iran, which exports around 2.6 million barrels of crude oil a day, was the second-largest exporter among the Organization of Petroleum Exporting Countries. Several major emerging economies depend on Iranian oil: 10% of South Korea's oil imports come from Iran, 9% of India's and 6% of China's. Moreover, Iranian oil makes up 7% of Japan's and 30% of all Greece's oil imports. Iran is also a major oil supplier to Spain and Italy. In the same year, officials in Iran estimate that Iran's annual oil and gas revenues could reach $250 billion by 2015 once the current projects come on stream. According to IHS CERA estimate, oil revenue of Iran will increase by a third to USD 100 billion in 2011 even though