Turkey has been implemented since 2010. Trade with the United States is pursued under the Generalized System of Preferences (GSP) with a preferential duty-free entry for approximately 4,650 products. Foreign direct investments Attracting foreign direct investments is set as a priority for the government of Serbia, which provides both financial and tax incentives to companies willing to invest. Leading investor nations in Serbia include: Germany, Italy, United States, China, Austria, Norway, and Greece. Majority of FDI went into automotive industry, food and beverage industry, machinery, textile and clothing. Blue-chip corporations making investments in manufacturing sector include: Fiat Chrysler Automobiles, Bosch, Michelin, Siemens, Panasonic, Continental, Schneider Electric, Philip Morris, LafargeHolcim, PepsiCo, Coca-Cola, Carlsberg and others. In the energy sector, Russian energy giants, Lukoil and Gazprom have made large investments. In metallurgy sector, Chinese steel and copper giants, Hesteel and Zijin Mining have acquired steel mill in Smederevo and copper mining complex in Bor, respectively. The financial sector has attracted investments from Italian banks such as Intesa Sanpaolo and UniCredit, Crédit Agricole and Société Générale from France, Erste Bank and Raiffeisen from Austria, among others. ICT and telecommunications saw investments from likes such as Microsoft, Telenor, Telekom Austria, and NCR. In retail sector, biggest foreign investors are Dutch Ahold Delhaize, German Metro AG and Schwarz Gruppe, Greek Veropoulos, and Croatian Fortenova. Economic sectors Agriculture Serbia has very favourable natural conditions (land and climate) for varied agricultural production. It has 5,056,000 ha of agricultural land (0.7 ha per capita), out of which 3,294,000 ha is arable land (0.45 ha per capita). In 2016, Serbia exported agricultural and food products worth $3.2 billion, and the export-import ratio was 178%. Agricultural exports constitute more than one-fifth of all Serbia's sales on the world market. Serbia is one of the largest provider of frozen fruit to the EU (largest to the French market, and 2nd largest to the German market). Agricultural production is most prominent in Vojvodina on the fertile Pannonian Plain. Other agricultural regions include Mačva, Pomoravlje, Tamnava, Rasina, and Jablanica. In the structure of the agricultural production 70% is from the crop field production, and 30% is from the livestock production. Serbia is world's second largest producer of plums (582,485 tons; second to China) and the third largest of raspberries (127,010 tons, trailing only Russia and the United States). It is also significant producer of maize (6.48 million tons, ranked 32nd in the world)