Inotera, Nanya Technology, HTC, CPT and AU Optronics have all opted to build or expand their factories in Taoyuan. Taoyuan has now become a bastion of electronics and semiconductor manufacturing. Over 200 of Taiwan's top 500 manufacturing companies have factories in Taoyuan. Taoyuan has also led Taiwan in terms of industrial output for nine straight years. There are now 29 (registered) industrial areas with of non-urban industrial land and of urban industrial land. There are over of land available for factories and industrial use in the city, representing the fact that Taoyuan's development bureau is based on industry and commerce. There are also 9 sites (57 ha; 140 acres) for mixed industrial-commercial use, the most of any county and city in Taiwan. On 26 March 2010, China Airlines (Taiwan's government-owned airline) moved into its new headquarters on the grounds of Taipei Taoyuan International Airport and in Dayuan Township in Taoyuan County (now Dayuan District, Taoyuan). EVA Air maintains its headquarters in Luzhu District. Evergreen Airlines Services Corporation, Evergreen Aviation Technologies Corp., and Evergreen Air Cargo Services Corporation, subsidiaries of Evergreen Group, are headquartered in Dayuan. On 25 December 2016, The Asia Silicon Valley Development Agency (ASVDA) was inaugurated in northern Taoyuan City, in a governmental effort to foster innovation, promote the Internet of Things (IoT) sector and attract top-class technology talent. The Asian Silicon Valley project aimed to transform Taiwan into an R&D hub for the IoT sector as well as a global center of entrepreneurship. Industry and environment A former RCA facility is located in the city. The RCA facility is the source of significant trichloroethylene contamination. Administration Taoyuan City is divided into 12 municipal districts and 1 mountain indigenous district. The city government is located within Taoyuan District. Colors indicate the common language status of Hakka and Formosan languages within each division. Prior to its upgrade to become municipality on 25 December 2014, Taoyuan County used to have 6 county-administered cities (Bade, Luzhu, Pingzhen, Taoyuan, Yangmei, Zhongli), 1 urban township (Daxi), 5 rural townships (Dayuan, Guanyin, Guishan, Longtan, Xinwu), and 1 Mountain indigenous township (Fuxing). Tourism Historical Sites Daxi Old Street Daxi Old Street is one of the more famous Taiwanese old streets. It used to be a bustling hub for camphor and the tea trade, filled with diverse stores with façades designed in a Baroque style. The street also has the Daxi Wood Art Ecomuseum, which includes