Germany is the third largest exporter in the world, with exports accounting for almost half of its economic output. Germany's main exports are: motor vehicles, trailers and semi-trailers (15 percent of total exports); machinery and equipment (14 percent); chemicals and chemical products (10 percent); computer, electronic and optical products (9 percent); basic pharmaceutical products and pharmaceutical preparations (7 percent); electrical equipment (7 percent); basic metals (5 percent); food products (4 percent); rubber and plastic products (4 percent); fabricated metal products, except machinery and equipment (3 percent) and other transport equipment (3 percent). Main export partners are: the US (9 percent of the total exports), China (8 percent), France and the Netherlands (7 percent each), Poland (6 percent), Italy, Austria and the United Kingdom (5 percent each), Switzerland and Belgium (4 percent each), Czech Republic and Spain (3 percent each).