area of and integrating four existing bonded zones—Waigaoqiao Free Trade Zone, Waigaoqiao Free Trade Logistics Park, Yangshan Free Trade Port Area, and Pudong Airport Comprehensive Free Trade Zone. Several preferential policies have been implemented to attract foreign investment in various industries to the zone. Because the zone is not technically considered Chinese territory for tax purposes, commodities entering the zone are exempt from duty and customs clearance. Demographics , Shanghai had a total population of 24,281,400, including 14,504,300 (59.7%) hukou holders (registered locally). According to the 2010 national census, 89.3% of Shanghai's population live in urban areas, and 10.7% live in rural areas. Based on the population of its total administrative area, Shanghai is the second largest of the four municipalities of China, behind Chongqing, but is generally considered the largest Chinese city because the urban population of Chongqing is much smaller. According to the OECD, Shanghai's metropolitan area has an estimated population of 34 million. According to the Shanghai Municipal Statistics Bureau, about 157,900 residents in Shanghai are foreigners, including 28,900 Japanese, 21,900 Americans and, 20,800 Koreans. The actual number of foreign citizens in the city is probably much higher. Shanghai is also a domestic immigration city—40.3% (9.8 million) of the city's residents are from other regions of China. Shanghai has a life expectancy of 83.6 years for the city's registered population, the highest life expectancy of all cities in mainland China. This has also caused the city to experience population aging—in 2017, 33.1% (4.8 million) of the city's registered population was aged 60 or above. In 2017, the Chinese government implemented population controls for Shanghai, resulting in a population decline of 10,000 people by the end of the year. Religion Due to its cosmopolitan history, Shanghai has a blend of religious heritage; religious buildings and institutions are scattered around the city. According to a 2012 survey, only 13.1% of the city's population belongs to organized religions, including Buddhists with 10.4%, Protestants with 1.9%, Catholics with 0.7%, and other faiths with 0.1% while the remaining 86.9% of the population could be either atheists or involved in worship of nature deities and ancestors or folk religious sects. Buddhism, in its Chinese varieties, has had a presence in Shanghai since the Three Kingdoms period, during which the Longhua Temple—the largest temple in Shanghai—and the Jing'an Temple were founded. Another significant temple is the Jade Buddha Temple, which was named after a