10 The income elasticity of oil demand could vary depending on the development stage of economy. According to the IEA report, when per-capita national income reaches about 3,000 dollars, the country's oil demand tends to increase sharply due to the development of manufacturing industries and the spread of automobiles, and when per-capita national income reaches about 9,000 dollars, the growth of oil demand in the country tends to slacken due to the maturization of industries. For detail, see IEA, Oil Market Report, March 2006.