90% of the country's total revenue. “Nigeria facts and figures” Nigeria facts and figures most oil-rich country its export earnings OPEC figures largest population of all OPEC members according to OPEC Nigeria facts and figures deposits according to OPEC its export earnings its export earnings more than 90 percent 90% of the country's total revenue. 92 percent of the total value its export earnings OPEC-member country said que incluye gas natural y minerales estratégicos its export earnings more than 90 percent crude oil OPEC-member country its export earnings OPEC Nigeria its export earnings according to OPEC "Nigeria facts and figures" pays membre de l’OPEP according to OPEC 欧佩克尼日利亚 total export revenue its export earnings http://www.opec.org/opec_web/en/about_us/167.htm according to OPEC "Nigeria facts and figures" website according to OPEC its export earnings