city of contrasts. Its central commercial districts, Zona Norte, is bounded by Plaza Colón and Plaza 14 de Septiembre, are generally equipped with modern urban amenities and are where the majority of the city's formal business and commercial industries are based. La Cancha, the largest open-air market in South America, is also an active place where locals can buy a range of items. An active nightlife is centered around Calle España and along the broad, tree-lined boulevard, El Prado. In contrast, the Zona Sur, a remote area adjacent to the Wilstermann International Airport is visibly impoverished, with adobe homes and unpaved roads, which is often the first impression visitors acquire while commuting into the city. In 2009, the government under President Evo Morales created a new constitution that declared Spanish and 36 other indigenous languages as the official languages of the country. However, the most widely spoken languages in Cochabamba are Spanish and Quechua. Although the Spanish that is spoken in the Cochabamba region is generally regarded as rather conservative in its phonetics and vocabulary, the use of Quechua terminology (wawa [child] and wistupiku [mouth or twist lips]) has been widely incorporated into its standardized form. As with most cities around the globe, English is increasingly spoken and understood, particularly among business-minded indigenous and repatriated Cochabambinos. English-language instruction has become incorporated into some private schools and universities but is not taught universally, therefore a vast majority of the population does not speak English. About four-fifths of the population of Bolivia identifies as Catholic. Like other cities that share the same ethnic group quadrants like Salta or Cuenca, Cochabamba's demographics consist of the following visible groups in order of prevalence: Indigenous (mostly of Quechua and Aymara ethnicity) people, Mestizo, or mixed Indigenous and Spanish European, and people of Spanish (Criollos) and other European descent. As well as a fairly significant population of Afro-Bolivians. By 2013, the human development index of the Metropolitan region of Cochabamba was 0.801 as a result of a 35% growth in the last 20 years. Government Cochabamba, formally the municipality of Cercado, is the capital of Cochabamba department. The city government is divided into executive and legislative branches. The mayor of Cochabamba is the head of the city government, elected by general election for a term of five years. The mayor heads an executive branch, which includes six sub-mayors and a variety of departments comprising 950 functionaries.