According to the World Bank, as of 2011, the Indian economy is nominally worth US$1.848 trillion; it is the tenth-largest economy by market exchange rates, and is, at US$4.457 trillion, the third-largest by purchasing power parity, or PPP. With its average annual GDP growth rate of 5.8% over the past two decades, and reaching 6.1% during 2011–12, India is one of the world's fastest-growing economies. However, the country ranks 140th in the world in nominal GDP per capita and 129th in GDP per capita at PPP. Until 1991, all Indian governments followed protectionist policies that were influenced by socialist economics. Widespread state intervention and regulation largely walled the economy off from the outside world. An acute balance of payments crisis in 1991 forced the nation to liberalise its economy; since then it has slowly moved towards a free-market system by emphasizing both foreign trade and direct investment inflows. India's recent economic model is largely capitalist. India has been a member of WTO since 1 January 1995.
The 487.6-million worker Indian labour force is the world's second-largest. The service sector makes up 55.6% of GDP, the industrial sector 26.3% and the agricultural sector 18.1%. Major agricultural products include rice, wheat, oilseed, cotton, jute, tea, sugarcane, and potatoes. Major industries include textiles, telecommunications, chemicals, food processing, steel, transport equipment, cement, mining, petroleum, machinery, and software. In 2006, the share of external trade in India's GDP stood at 24%, up from 6% in 1985. In 2008, India's share of world trade was 1.68%; In 2011, India was the world's tenth-largest importer and the nineteenth-largest exporter. Major exports include petroleum products, textile goods, jewelry, software, engineering goods, chemicals, and leather manufactures. Major imports include crude oil, machinery, gems, fertiliser, and chemicals. Between 2001 and 2011, the contribution of petrochemical and