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The economy of Germany is a highly developed social market economy. It has the largest national economy in Europe, the fourth-largest by nominal GDP in the world (almost tied with Japan), and fifth by GDP (PPP). Due to a volatile currency exchange rate, Germany's GDP as measured in dollars fluctuates sharply. In 2017, the country accounted for 28% of the euro area economy according to the International Monetary Fund (IMF). Germany is a founding member of the European Union and the Eurozone. In 2016, Germany recorded the highest trade surplus in the world, worth 1810.93 billion worth of goods and services exported in 2019. The service sector contributes around 70% of the total GDP, industry 29.1%, and agriculture 0.9%. Exports accounted for 41% of national output. The top 10 exports of Germany are vehicles, machinery, chemical goods, electronic products, electrical equipment, pharmaceuticals, transport equipment, basic metals, food products, and rubber and plastics. The economy of Germany is the largest manufacturing economy in Europe, and it is less likely to be affected by a financial downturn. Germany conducts applied research with practical industrial value and sees itself as a bridge between the latest university insights and industry-specific product and process improvements. It generates a great deal of knowledge in its own laboratories. Germany is rich in timber, lignite, potash and salt. Some minor sources of natural gas are being exploited in the state of Lower Saxony. Until the German reunification, the German Democratic Republic mined for uranium in the Ore Mountains (see also: SAG/SDAG Wismut). Energy in Germany is sourced predominantly by fossil fuels (30%), with wind power in second place, then nuclear power, gas, solar, biomass (wood and biofuels) and hydro. Germany is the first major industrialized nation to commit to the renewable energy transition called Energiewende.