World Bank, estimated in their 2011 reports that if India's economy continues to grow per projections, India's middle income group would double by 2015 over 2010 levels, and grow by an additional 500 million people by 2025. This would make it, with China, the world's largest middle income market. Compared to other countries, income inequality in India is relatively small as measured by Gini coefficient. India had a Gini coefficient of 32.5 in the year 1999- 2000; India's nominal Gini index rose to 36.8 in 2005, while real Gini after tax remained nearly flat at 32.6. The states of India have significant disparities in their average income. Bihar was by far the poorest in India, and per capita income was low in its neighbouring states, along with Uttar Pradesh, Jharkhand, Jammu & Kashmir, Assam, Manipur, and Nagaland. The higher income states include Goa, Delhi, Haryana, Sikkim, Telangana, Maharashtra, Tamil Nadu, Gujarat, Himachal Pradesh, Punjab, Uttarakhand, and Kerala. Rural-urban gap As in other countries, residents of Indian cities have a higher per capita income and standard of living than rural residents. Towns and cities make more than two-thirds of the Indian GDP, even though less than a third of the population live in them. India has a high rate of migration from rural areas to urban areas. A major reason for migration to cities was the Partition of India. More than half of the refugees from Pakistan settled in urban areas such as Delhi. It is estimated that up to 590 million people, or 40% of the Indian population will be living in cities by 2030, much higher than the current 28%. It is also estimated that eight states, including West Bengal, Tamil Nadu, Gujarat, Maharashtra, Karnataka, Kerala, Telangana, and Punjab will have more than half of their total population living in Urban areas by 2030. In India, urban areas have seen a much higher growth rate as compared to rural areas. Despite up to three-fourths of the population living in rural areas, rural areas contribute to only one-third of the national income. The main reason for rural India's poor performance in terms of income is the fact that rural India is mostly dependent on agriculture. The agriculture sector in India grew at a rate of only 1.6% in 2008-09, while the Indian Economy grew at a rate of 6.7%, despite the financial crisis of 2007–2008. An extremely slow rate of