 In 2012, Qatar retained its title of richest country in the world (according to per capita income) for the third time in a row, having first overtaken Luxembourg in 2010.According to the study published by the Washington-based Institute of International Finance, Qatar's per capita GDP at purchasing power parity (PPP) was $106,000 (QR387,000) in 2012, helping the country retain its ranking as the world's wealthiest nation.Luxembourg came a distant second with nearly $80,000 and Singapore third with per capita income of about $61,000.