About 42% of Senegal's population is rural. In rural areas, population density varies from about 77 per square kilometer (200/mile²) in the west-central region to 2 per square kilometer (5/mile²) in the arid eastern section. The average population density for the country is 68 people per square kilometer (169/sq mi). French is the official language but is used regularly only by the literate minority. Almost all Senegalese speak an indigenous language, of which Wolof has the largest usage. Many Senegalese live in Europe, particularly in France, Italy and Spain.