premise: The first annual Africa Cup of Nations occurred in 2015.
hypothesis: The 2013 Africa Cup of Nations , also known as the Orange Africa Cup of Nations South Africa 2013 for sponsorship reasons , held from 19 January to 10 February 2013 , was the 29th Africa Cup of Nations , the football championship of Africa organized by the Confederation of African Football ( CAF ) . Africa Cup of Nations . It is sanctioned by the Confederation of African Football ( CAF ) , and was first held in 1957 . Since 1968 , it has been held every two years .