Source: U.S. Bureau of Economic Analysis
Release: Gross Domestic Product
BEA Account Code: LB000006
A Guide to the National Income and Product Accounts of the United States (NIPA) - (http://www.bea.gov/national/pdf/nipaguid.pdf)
U.S. Bureau of Economic Analysis, Real Exports of goods: Industrial supplies and materials: Nondurable goods: Petroleum and products [LB0000061Q020SBEA], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/LB0000061Q020SBEA, August 19, 2018.