the state's top five crops. Tea is produced commercially in northern districts; the region is well known for Darjeeling and other high-quality teas. State industries are localised in the Kolkata region, the mineral-rich western highlands, and the Haldia Port region. The Durgapur-Asansol colliery belt is home to a number of steel plants. Important manufacturing industries include: engineering products, electronics, electrical equipment, cables, steel, leather, textiles, jewellery, frigates, automobiles, railway coaches and wagons. The Durgapur centre has established several industries in the areas of tea, sugar, chemicals and fertilisers. Natural resources like tea and jute in nearby areas have made West Bengal a major centre for the jute and tea industries. Years after independence, West Bengal is dependent on the central government for help in meeting its demands for food; food production remained stagnant, and the Indian green revolution bypassed the state. However, there has been a significant increase in food production since the 1980s and the state now has a surplus of grains. The state's share of total industrial output in India was 9.8% in 1980–1981, declining to 5% by 1997–1998. In contrast, the service sector has grown at a rate higher than the national rate. The state's total financial debt stood at as of 2011. In the period 2004–2010, the average gross state domestic product (GSDP) growth rate was 13.9% (calculated in Indian rupee terms) lower than 15.5%, the average for all states of the country. The economy of West Bengal has witnessed many surprising changes in direction. The agricultural sector in particular rose to 8.33% in 2010–11 before tumbling to −4.01% in 2012–13. Many major industries such as the Uttarpara Hindustan Motors car manufacturing unit, the jute industry, and the Haldia Petrochemicals unit experienced shutdowns in 2014. In the same year, plans for a 300 billion Jindal Steel project was mothballed. The tea industry of West Bengal has also witnessed shutdowns for financial and political reasons. The tourism industry of West Bengal was negatively impacted in 2017 because of the Gorkhaland agitation. However, over the years due to effective changes in the stance towards industrialisation, ease of doing business has improved in West Bengal. Steps are being taken to remedy this situation by promoting West Bengal as an investment destination. A leather complex has been built in Kolkata. Smart cities are being planned close to Kolkata, and major roadway projects are in the offing to revive the economy.