The total percentage of Mexico's indigenous peoples tends to vary depending on the criteria used by the government in its censuses: if the ability to speak an indigenous language is used as the criterion to define a person as indigenous, it is 6.1%, if racial self-identification is used, it is 14.9% and if people who consider themselves part indigenous are also included, it amounts to 23%. Nonetheless, all the censuses conclude that the majority of Mexico's indigenous population is concentrated in rural areas of the southern and south-eastern Mexican states, with the highest percentages being found in Yucatán (59% of the population), Oaxaca (48%), Quintana Roo (39%), Chiapas (28%), and Campeche (27%).