Equatorial Guinea is the only sovereign state in Africa where Spanish is the national language. Spain's power had already started to dwindle by the time Europe turned its eyes to expanding in the Old World. After the oil boom of the mid-1990s and with a population of just 1.2 million people, Equatorial Guinea is the richest country in Africa if measured by GDP/capita (36th in the world). At $43,500, that is just ahead of old colonial powers France and the United Kingdom. Despite that, less than half the population have access to clean drinking water. As of February 2016, President Obiang has been in power the longest of any African head of state. This places him 8th in the world behind the leaders of Cameroon, Sweden, Denmark, Oman, Bahrain, Brunei and the globes longest reigning leader Queen Elizabeth II (who heads 16 governments).