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United States. Department of Commerce. "Gross Domestic Product: Fourth Quarter and Annual 2013 (Second Estimate) : Tables, BEA 14-06," United States Department of Commerce News (February 28, 2014). https://fraser.stlouisfed.org/title/6148/item/602086/content/xls/bea_newsreleases_20140228_tables-only, accessed on June 9, 2026.