a one-way ride to the city. From this airport, there is a bus shuttle to nearby Saltillo. Inter-city bus services run daily into the interior, as well as north to the US border and points beyond. A public transportation bus line operated by the Nuevo Leon State Government called the Ruta Express (Express Route) also operates from the airport to the Line 1 "Y-Griega" Metro Station. Water Economy Monterrey is a major industrial center in northern Mexico, with a GDP (PPP) of US$140 billion and a GDP (PPP) per capita of US$31,900 in 2015. The city was rated by Fortune magazine in 1999 as the best city in Latin America for business and is currently ranked third best by the América Economía magazine. The city has prominent positions in sectors such as steel, cement, glass, auto parts, and brewing. The city's economic wealth has been attributed in part to its proximity to the United States-Mexico border and economic links to the United States. Industrialization was accelerated in the mid-19th century by the Compañia Fundidora de Fierro y Acero Monterrey, a steel-processing company. Today, Monterrey is home to transnational conglomerates such as Cemex (the world's third largest cement company), FEMSA (Coca-Cola Latin America, largest independent Coca-Cola bottler in the world), Alfa (petrochemicals, food, telecommunications and auto parts), Axtel (telecommunications), Vitro (glass), Selther (leading mattress and rest systems firm in Latin America), Gruma (food), and Banorte (financial services). The FEMSA corporation owned a large brewery, the Cuauhtémoc Moctezuma Brewery (Cervecería Cuauhtémoc Moctezuma) that produces the brands Sol, Tecate, Indio, Dos Equis and Carta Blanca among others, in the beginning of the year Cuauhtémoc Moctezuma Brewery was sold to Dutch-based company Heineken. By the end of the same year, there were more than 13,000 manufacturing companies, 55,000 retail stores, and more than 52,000 service firms in Monterrey. The metals sector, dominated by iron and steel, accounted for 6 percent of manufacturing GNP in 1994. Mexico's steel industry is centered in Monterrey, where the country's first steel mills opened in 1903. Steel processing plants in Monterrey, privatized in 1986, accounted for about half of Mexico's total steel output in the early 1990s. Monterrey was ranked 94th worldwide and fifth in Latin America in terms of Quality of Life according to Mercer Human Resource Consulting (2006), and was ranked second in 2005 and fourth in 2006, according to América Economía. Some of the shopping malls