and other rolling stock for Indian Railways. The Ambattur–Padi industrial zone houses many textile manufacturers, and a special economic zone (SEZ) for apparel and footwear manufacturing has been set up in the southern suburbs of the city. Chennai contributes more than 50 percent of India's leather exports. Many software and software services companies have development centres in Chennai, which contributed 14 percent of India's total software exports of 14,42,140 lakh during 2006–07, making it the second largest Indian city software exporter following Bangalore. The Tidel Park in Chennai was billed as Asia's largest IT park when it was built. Major software companies have their offices set up here, with some of them making Chennai their largest base. Prominent financial institutions, including the World Bank, Standard Chartered Bank, ABN AMRO, Bank of America, The Royal Bank of Scotland, Goldman Sachs, Barclays, HSBC, ING Group, Allianz, Sumitomo Mitsui Banking Corporation, The Bank of Tokyo-Mitsubishi UFJ, Abu Dhabi Commercial Bank, Asian Development Bank, Credit Suisse, BNP Paribas Fortis, Irevna, Deutsche Bank and Citibank have back office and development centre operations in the city. Chennai is home to the national level commercial banks Indian Bank and Indian Overseas Bank and many state level co–operative banks, finance and insurance companies. Telecom and Electronics manufacturers based in and around Chennai include Samsung, Nokia Siemens, Motorola, Lenovo, Dell, Force10, Wipro, Flextronics and Siemens among others. Chennai is currently the largest electronics hardware exporter in India, accounting for 45% of the total exports in 2010–11. Telecom giants Ericsson and Alcatel-Lucent, pharmaceuticals giant Pfizer and chemicals giant Dow Chemicals have research and development facilities in Chennai. The TICEL bio–tech park at Taramani and Golden Jubilee bio–tech park at Siruseri houses biotechnology companies and laboratories. The World Trade Center complex is located at Perungudi on the southern side of the city. According to Jones Lang LaSalle, demand for investment-grade buildings in Chennai is high from IT companies. The average annual gross demand in Chennai is 4.5 million square feet. A study conducted by the National Housing Bank on the residential price index of Indian cities showed that Chennai experienced the highest growth after the financial crisis of 2007–2008. Medical tourism is an important part of Chennai's economy with 45 percent of total medical tourists to India making to Chennai. The Tamil film industry and the Tamil television industry are also significant parts of Chennai's economy. The city also has a