Electric power is supplied to the whole urban area and running water reaches 97% of the population (about 350,000 homes). Natural gas is provided to 227,152 homes. With the recovery of the national economy since 2002, the city experienced a real-estate boom. In the period 2003–2006, the construction sector added 2 million m2, investing about $900 million. Despite this increased supply, both price and rent have increased sharply compared to the values during the 1990s. According to experts, this growth was propelled by the increased purchasing power of farmers around Rosario, helped by competitive exports, and the overall preference for safer investment options. Rosario has a number of public health centers: 5 municipal hospitals (including a children's hospital and an emergency hospital/trauma center) and a municipal outpatient-only center, plus 2 large provincial hospitals (Hospital Provincial and Hospital Centenario), and their associated primary care centers in the city proper and its metropolitan area. Rosario is the main epicentre of a metropolitan region whose economy is based on services and industry, generating the second largest urban gross regional product of Argentina, after Greater Buenos Aires. The principal manufacturing sector is the agro industry, whose industries are placed in the northern and southern areas of the Greater Rosario; the investments over the last decade have transformed Rosario into a major role of processing oil of the world  Many other sectors contribute to the diversified industrial offerings of the city. Rosario and its metropolitan area produce 20% of the cars, 4% of the domestic refrigerators, 80% of the machinery for the food industry and 100% of the auto bodies for long-distance buses made in Argentina. Other important sectors include the petrochemical sector, with three plants located in the suburbs of San Lorenzo and Port San Martin; the chemistry sector, with plants for sulphuric acid, fertilizers, resins and other products; the cellulose industry; the meat industry; ironworks; auto parts; the plants and equipment for bottled oil; agricultural machinery; and the materials and equipment for the construction industry. Worldwide international companies settled in Rosario include, among others, General Motors, Cargill, Unilever, John Deere, Petrobrás, ICI, Dow, Tenneco and Mahle. The main financial bank at the city of Rosario is the Municipal Bank of Rosario. Its central offices are located in the financial district, on San Martín St., and there are several additional offices throughout the city. It is focused on small and medium enterprises and other organizations, especially through micro credits, and may be considered an "ethical bank."