Nigeria - 1 March 2018 Nigeria - 23 March 2018 Liberia - 22 February 2018 Previous years Nigeria - 28 June 2017 Benin, Togo and Burkina Faso - 10 March 2017 Benin - 13 June 2016 Nigeria - 27 May 2016 Togo - 23 March 2016 Benin - 19 February 2016 Nigeria - 27 January 2016