Once a predominantly agricultural country on account of its arable landscape, since 1945 Denmark has greatly expanded its industrial base and service sector. By 2017 services contributed circa 75% of GDP, manufacturing about 15% and agriculture less than 2%. Major industries include wind turbines, pharmaceuticals, medical equipment, machinery and transportation equipment, food processing, and construction. Circa 60% of the total export value is due to export of goods, and the remaining 40% is from service exports, mainly sea transport. The country's main export goods are: wind turbines, pharmaceuticals, machinery and instruments, meat and meat products, dairy products, fish, furniture and design. Denmark is a net exporter of food and energy and has for a number of years had a balance of payments surplus which has transformed the country from a net debitor to a net creditor country. By 1 July 2018, the net international investment position (or net foreign assets) of Denmark was equal to 64.6% of GDP.