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United States. Bureau of Economic Analysis. "U.S. International Trade in Goods and Services, December 2021 : Tables: U.S. Trade in Goods and Services, 1960-Present, BEA 22-04, CB 22-16," Bureau of Economic Analysis (BEA) News Releases (February 8, 2022). https://fraser.stlouisfed.org/title/6148/item/610914/content/xlsx/bea_newsreleases_20220208_tables-ustrade1960, accessed on July 17, 2024.