The US Central Intelligence Agency (CIA) reported that in 2000 Afghanistan's gross domestic product (GDP) was estimated at $21 billion. The per capita GDP was estimated at $800. The CIA defines GDP as the value of all final goods and services produced within a nation in a given year and computed on the basis of purchasing power parity (PPP) rather than value as measured on the basis of the rate of exchange. It was estimated that agriculture accounted for 60% of GDP, industry 20%, and services 20%. Foreign aid receipts amounted to about $15 per capita.