The US Central Intelligence Agency (CIA) reports that in 2001 the United Arab Emirates' gross domestic product (GDP) was estimated at $51 billion. The per capita GDP was estimated at $21,100. The annual growth rate of GDP was estimated at 5.6%. The average inflation rate in 2000 was 4.5%. The annual rate of GDP growth between 1988 and 1998 was about 4.2%. 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. Petroleum extraction accounts for approximately 34.2% of GDP; manufacturing, 11%; wholesale and retail trade, 10%; government services, 9.6%; business, 8%, and construction, 7.4%. Foreign aid receipts amounted to about $1 per capita.