Mexico is the country with the highest percentage of 15-year-old participating students with a PISA index of economic, social and cultural status below -1.0, with 58.2%, followed by Turkey with 58.0% and then Chile with 37.2%. The socio-economic profile of the education system in Mexico for 2009 remained unchanged since 2000 (PISA 2009 Results Volume V, Table V.4.2).