Cocoa is Nigeria's second-biggest foreign-exchange earner

Cocoa is the second-biggest foreign-exchange earner for Nigeria,  Africa’s leading oil producer...ICCO Exports of beans in 2010 rose 2.3 percent to 200,333 metric tons, according to data from the Federal Produce Inspection Services, a government agency that supervises the shipments.

...the Nigetain government also need to sustain and increase its export potentials in related non-oil products. Other export candidates are Groundnuts, Palm Oil, and Cassava