summarize the following text in English: The city has a post-industrial economy that is dominated by the tertiary sector (services), which generated 76.9% of output, followed by the secondary sector (manufacturing, construction) at 22.2% and the primary sector (agriculture, mining) at 0.8%.

The services sector is broadly diversified with professional services, wholesale and retail, information technology, commercial real estate, scientific research, and residential real estate each contributing at least 6% to the city's economy in 2013.[139]

The single largest sub-sector remains industry, whose share of overall output has shrunk to 18.1% in 2013.[139] The mix of industrial output has changed significantly since 2010 when the city announced that 140 highly-polluting, energy and water resource intensive enterprises would be relocated from the city in five years.[140] The relocation of Capital Steel to neighboring Hebei province had begun in 2005.[141][142] In 2013, output of automobiles, aerospace products, semiconductors, pharmaceuticals, and food processing all increased.[139]

In the farmland around Beijing, vegetables and fruits have displaced grain as the primary crops under cultivation.[139] In 2013, the tonnage of vegetable, edible fungus and fruit harvested was over three times that of grain.[139] In 2013, overall acreage under cultivation shrank along with most categories of produce as more land was reforested for environmental reasons.[139]

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