guyana
guyana: Page 1
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Chart shows percentage of foreign country's population in U.S.: Guyana at 32%, Mexico at 11% - 04/27/09
There's a chart here (see UPDATE) showing the percentages of various foreign countries populations who now live in the U.S. The data is from a government source and Pew Hispanic and is from 2007. The figures are probably on the low side.