taxes. Hydroelectric power As of 2012, Sierra Leone has 3 main hydroelectric plants. The first is the Guma plant which was decommissioned in 1982, the second is the Dodo Plant which is located in the Eastern Province, and finally the Bumbuna plant. There is also potential for several new hydroelectric plants to be opened on the Sewa River, Pampana River, Seli River, Moa River, and Little Scarcies. Amongst all these projects, both finished and potential, the Bumbuna dam still remains the largest of the hydroelectric projects in Sierra Leone. It is located near the Seli River and Freetown and was estimated to produce about 50 megawatts of electricity. There were plans to increase its capacity 400 megawatts by 2017 which would cost around $750 million. It has been projected that the Bumbuna dam could potentially reduce the amount of spending on foreign fuel and save the country at least $2 million a month. In the past this project received its funding of over $200 million from a combination of the World Bank, the African Development Bank, and the Italian company Salini Impregilo. Demographics In 2019 Sierra Leone had a population of 7,813,215 and a growth rate of 2.216% a year. The country's population is mostly young, with an estimated 41.7% under 15, and rural, with an estimated 62% of people living outside the cities. As a result of migration to cities, the population is becoming more urban with an estimated rate of urbanisation growth of 2.9% a year. Population density varies greatly within Sierra Leone. The Western Area Urban District, including Freetown, the capital and largest city, has a population density of 1,224 persons per square km. The largest district geographically, Koinadugu, has a much lower density of 21.4 persons per square km. English is the official language, spoken at schools, government administration and in the media. Krio (derived from English and several indigenous African languages, and the language of the Sierra Leone Krio people) is the most widely spoken language in virtually all parts of Sierra Leone. As the Krio language is spoken by 90% of the country's population, it unites all the different ethnic groups, especially in their trade and interaction with each other. After the contribution made by the Bangladesh UN Peacekeeping Force in the Sierra Leone Civil War under the United Nations Mission in Sierra Leone, the government of Ahmad Tejan Kabbah declared Bengali an honorary