United States. Bureau of Economic Analysis. "U.S. International Trade in Goods and Services: Annual Revision for 2016, BEA 17-26, CB 17-85, FT-900 (17-04)," Bureau of Economic Analysis (BEA) News Releases (June 2, 2017). https://fraser.stlouisfed.org/title/6148/item/602497, accessed on September 18, 2024.