Over the weekend citizens of Africa’s largest economy and democracy voted in the most hotly contested presidential election since military rule ended in 1999. The winner, who will replace outgoing President Muhammadu Buhari, is expected to be announced early this week. Three frontrunners have emerged: Atiku Abubakar and Bola Ahmed Tinubu - political insiders who have faced corruption allegations in the past – and Peter Obi, who has been hailed as an anti-establishment candidate and rallied the country’s young people. The election comes as Nigeria grapples with economic and security issues, with two-thirds of its 220m people living in poverty, oil production dropping to a 40-year low and annual inflation of over 20%.