After becoming independent from Spain in 1968, Equatorial Guinea was ruled by President for life Francisco Macías Nguema until he was overthrown in a coup in 1979 by his nephew Teodoro Obiang Nguema Mbasogo who has served as the country's president since. Both presidents have been widely characterized as dictators by foreign observers. Since the mid-1990s, Equatorial Guinea has become one of sub-Saharan Africa's largest oil producers. It has subsequently become the richest country per capita in Africa, and its gross domestic product (GDP) adjusted for purchasing power parity (PPP) per capita ranks 43rd in the world; however, the wealth is distributed extremely unevenly, with few people benefiting from the oil riches. The country ranks 144th on the 2019 Human Development Index, with less than half the population having access to clean drinking water and around 1 in 12 children dying before the age of five.