This modern private enterprise economy has capitalized on its central geographic location, highly developed transport network, and diversified industrial and commercial base. Industry is concentrated mainly in the populous Flemish area in the north. With few natural resources, Belgium must import substantial quantities of raw materials and export a large volume of manufactures, making its economy unusually dependent on the state of world markets. Roughly three-quarters of its trade is with other EU countries. Public debt is about 100% of GDP, and the government has succeeded in balancing its budget. Belgium, together with 11 of its EU partners, began circulating the euro currency in January 2002. Economic growth in 2001-03 dropped sharply because of the global economic slowdown. Prospects for 2004 again depend largely on recovery in the EU and the US.