have constructed a Hydroelectric Power station at Guatapé with the Santa Rita Dam. Today the hydroelectric complex of Eastern Antioquia consists of five power stations, two of which are public companies of Medellín city. Demographics According to the figures presented by the National Administrative Department of Statistics (DANE) in the 2005 census, the municipality of Rionegro had a total population of 101,046 inhabitants, the sixth largest populated area in Antioquia. The municipality had a population density of approximately 466 inhabitants per square kilometer. The ethnicity of the population is almost entirely of Mestizo and White persons (98.9%) with 1.1% Afro Colombian. 48.6% of the population are men and 51.4% women and city had a rate of 5.7% who were illiterate, but most of these were under 5 years of age and not yet eligible or mature enough for an education. Public services in Rionegro are of a relatively high standard with 98.7% of houses supplied with electricity, 95.6% with a water supply and 87.1% with a telephone connection. Ethnicity According to DANE statistics 2005, the ethnic composition of this city is: Whites and Mestizos (98.5%) Black (1.1%) Administration Rionegro is governed by a democratic system based on the processes of administrative decentralization generated by the proclamation of Political constitution of Colombia in 1991. For the city there is a mayor with executive authority and a Municipal Council with legislative rights. The Mayor of Rionegro is naturally the head of the local government and the municipal administration, representing legal, judicial authority in the municipality. The position of mayor is chosen by popular vote for a period of four years, that at present is a position held by Hernan Ospina with Andres Julian Rendón as elected major for the term 2016–2019. Amongst his main functions are the administration of the resources of the municipality including responsibility of health, housing, education and road infrastructure, to guard the well-being and respond to the interests of his fellow citizens and to represent them before the National Government, besides being impelled to implement local policies to improve quality of life within the municipality. The Municipal council of Rionegro, is also subject to election, composed by 17 politicians of varying political parties, chosen for a period of four years. The council is the associated executive organization of the municipality with obligation to take responsibility for Rionegro's territorial jurisdiction. Amongst its functions are approving the proposals and projects