Saw this pdf "Annual Report 1914, Nigeria "  which showed gross revenue between the north and southern regions after one year of almagation.

Go to page 7 and see for yourself how Nigeria's greatest revenue earner at over €1million pounds ( at least 10 times higher than any commodity export even cocoa) is proof that Niger Delta and eastern Nigeria has been feeding Nigeria since almagation.



Source: http://thesummary.com.ng/index.php/news-categories/national/item/8159-annual-report-of-nigeria-1914-palm-oil-highest-revenue-earner-see-others