Mexico is the most populous Spanish-speaking country in the world and the second most-populous country in Latin America after Portuguese-speaking Brazil. About 76% of the people live in urban areas. Many Mexicans emigrate from rural areas that lack job opportunities--such as the underdeveloped southern states and the crowded central plateau--to the industrialized urban centers and the developing areas along the U.S.-Mexico border. According to some estimates, the population of the area around Mexico City is nearly 22 million, which would make it the largest concentration of population in the Western Hemisphere. Cities bordering on the United States--such as Tijuana and Ciudad Juarez--and cities in the interior--such as Guadalajara, Monterrey, and Puebla--have undergone sharp rises in population in recent years.
Mexico has made great strides in improving access to education and literacy rates over the past few decades. According to a 2006 World Bank report, enrollment at the primary level is nearly universal, and more children are completing primary education. The average number of years of schooling for the population 15 years old and over was around eight years during the 2004-2005 school year, a marked improvement on a decade earlier--when it was 6.8 years--but low compared with other Organization for Economic Cooperation and Development (OECD) countries.