Level of adult HIV prevalence ( percentage ) Sources : Column 1 : United Nations Educational , Scientific and Cultural Organization ( UNESCO ) Institute for Statistics ( http : //www.uis.unesco.org/ , accessed 23 November 2004 ; columns 2-11 : United Nations Development Programme ( UNDP ) , Human Development Report 2004 ( New York , Oxford University Press , 2004 ) , based on data from UNESCO Institute for Statistics , Food and Agriculture Organization of the United Nations ( FAO ) and United Nations Children 's Fund ( UNICEF ) . Note : Two dots ( .. ) signify data unavailable ; the figures represent the unweighted averages for countries with available information included in each group ; PPP = purchasing power parity ; GDP = gross domestic product .