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United States. Bureau of Economic Analysis. "U.S. International Trade in Goods and Services, December 2020 : Tables, BEA 21-04, CB 21-17," Bureau of Economic Analysis (BEA) News Releases (February 5, 2021). https://fraser.stlouisfed.org/title/6148/item/600388/content/xlsx/bea_newsreleases_20210205_tables, accessed on March 17, 2025.