Tourism in India is the largest service industry, with a contribution of 6.23% to the national GDP and 8.78% of the total employment in India. India witnesses more than 17.9 million annual foreign tourist arrivals and 740 million domestic tourism visits. The tourism industry in India generated about 100 US$ billion in 2008 and that is expected to increase to US$275.5 billion by 2018 at a 9.4% annual growth rate. In the year 2010, 17.9 million foreign tourists visited India. Majority of foreign tourists come from USA and UK. Maharashtra, Tamil Nadu, Delhi, Uttar Pradesh and Rajasthan are the top 5 states to receive inbound tourists. Domestic tourism in the same year was massive at 740 million. Andhra Pradesh, Uttar Pradesh, Tamil Nadu and Maharashtra received the big share of these visitors. Ministry of Tourism is the nodal agency to formulate national policies and programmes for the development and promotion of tourism. In the process, the Ministry consults and collaborates with other stakeholders in the sector including various Central Ministries/agencies, the State Governments/ union Territories and the representatives of the private sector. Concerted efforts are being made to promote new forms of tourism such as rural, cruise, medical and eco-tourism. The Ministry of Tourism is the nodal agency for the development and promotion of tourism in India and maintains the Incredible India campaign. According to World Travel and Tourism Council, India will be a tourism hotspot from 2009–2018, having the highest 10-year growth potential. The Travel & Tourism Competitiveness Report 2007 ranked tourism in India 6th in terms of price competitiveness and 39th in terms of safety and security. Despite short- and medium-term setbacks, such as shortage of hotel rooms, tourism revenues are expected to surge by 42% from 2007 to 2017. India's 5,000 years of history, its length, breadth and the variety of geographic features make its tourism basket large and varied. It presents heritage and cultural tourism along with medical, business and sports tourism. India has a growing medical tourism sector. The 2010 Commonwealth Games in Delhi were expected to significantly boost tourism in India. India is home to several well known large mammals including the Asian Elephant, Bengal Tiger, Asiatic Lion, Leopard and Indian Rhinoceros, often engrained culturally and religiously often being associated with deities. Other well known large Indian mammals include ungulates such as the domestic Asian Water buffalo, wild Asian Water buffalo, Nilgai, Gaur and several species of deer and antelope. Some members of the dog family such as the Indian Wolf, Bengal Fox, Golden Jackal and the Dhole or Wild Dogs are also widely distributed. It is also home to the Striped Hyaena, Macaques, Langurs and Mongoose species. India also has a large variety of protected wildlife. The country's protected forest consists of 75 National parks of India and 421 sanctuaries, of which 19 fall under the purview of Project Tiger. Its climatic and geographic diversity makes it the home of over 350 mammals and 1200 bird species, many of which are unique to the subcontinent. Some well known national wildlife sanctuaries include Bharatpur, Corbett, Kanha, Kaziranga, Periyar, Ranthambore, Manas and Sariska. The world's largest mangrove forest Sundarbans is located in southern West Bengal. The Kaziranga National Park, Manas National Park, Sundarbans and Keoladeo National Park are UNESCO World Heritage Site. Medical tourism is a growing sector in India. India’s medical tourism sector is expected to experience an annual growth rate of 30%, making it a Rs. 9,500-crore industry by 2015. Estimates of the value of medical tourism to India go as high as $2 billion a year by 2012. As medical treatment costs in the developed world balloon - with the United States leading the way - more and more Westerners are finding the prospect of international travel for medical care increasingly appealing. An estimated 150,000 of these travel to India for low-priced healthcare procedures every year. Advantages for medical tourists include reduced costs, the availability of latest medical technologies and a growing compliance on international quality standards, as well as the fact that foreigners are less likely to face a language barriers in India. The Indian government is taking steps to address infrastructure issues that hinder the country's growth in medical tourism. Most estimates claim treatment costs in India start at around a tenth of the price of comparable treatment in America or Britain. The most popular treatments sought in India by medical tourists are alternative medicine, bone-marrow transplant, cardiac bypass, eye surgery and hip replacement. India is known in particular for heart surgery, hip resurfacing and other areas of advanced medicine.