US GDP has more than tripled from 1960 to 2011

1960 to 2011, the United States' Gross National Product has more than tripled from, growing from $521 Billion to $15 Trillion.

Source: U.S. Department of Commerce, Bureau of Economic Analysis, National Data: National Income and Product Accounts Tables: Table 1.1.5. Gross Domestic Product, accessed March 18, 2013 [verified 4/17/14

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