The economy of Illinois is the fifth largest by GDP in the United States and one of the most diversified economies in the world. Fueled by the economy of Chicago, the Chicago metropolitan area is home to many of the United States' largest companies, including Abbott Laboratories, AbbVie Inc., Allstate, Baxter International, Boeing, Caterpillar, Conagra, Crate and Barrel, Kraft Heinz, McDonald's, CNH Industrial, GE Healthcare, Aon PLC, Willis Towers Watson, Mondelez International, Motorola, United Airlines, US Foods, Walgreens, and more. The Chicago area is a global financial center and headquarters a wide variety of financial institutions including Citadel LLC, CNA Financial, Discover Financial Services, Morningstar, Inc., Nuveen, and more. Chicago is also home to the largest futures exchange in the world, the Chicago Mercantile Exchange. Across the state, other Fortune 500 world headquarters based in Illinois include State Farm in Bloomington and John Deere in Moline. As of 2017, Illinois ranked fourth in the nation for the most Fortune 500 based companies with a total of 36. For six consecutive years, Chicagoland was ranked the nation's top metropolitan area for corporate relocations. The 2018 total gross state product for Illinois was $857 billion, placing it fifth in the nation. The 2017 median household income was $62,992, one of the nation's highest. In 2016, the nine counties of the Chicago metropolitan area accounted for 77.3% of the state's total wages, with the remaining 93 counties at 22.7%. The state's industrial outputs include machinery, food processing, electrical equipment, chemical products, publishing, fabricated metal products and transportation equipment. Corn and soybeans are important agricultural products. Service industries of note are financial trading, higher education, logistics, and medicine. Agriculture Most of the state of Illinois lies outside the Chicago metropolitan area and inside the North American Corn Belt. Corn, soybeans, and other large-field crops are grown extensively. These crops and their products account for much of the state's economic output outside Chicago. Much of the field crop is remanufactured into feed for hogs and cattle. Dairy products and wheat are important secondary crops in specific segments of the state. In addition, some Illinois farmers grow specialty crops such as popcorn and pumpkins. The state is the largest producer of pumpkins among the U.S. states. There is a large watermelon growing area centered on Lincoln, Illinois. Illinois wine is a growing industry. In December 2006, the Shawnee Hills were named Illinois's first American Viticultural Area