ver em http://www.prb.org
nota sobre as fontes dos dados:
"The rates and figures are primarily compiled from the following sources: official country statistical yearbooks, bulletins, and websites; United Nations Demographic Yearbook, 2005 of the UN Statistics Division; World Population Prospects: The 2008 Revision of the UN Population Division; Recent Demographic Developments in Europe, 2005 of the Council of Europe; and the International Data Base and library resources of the International Programs Center, U.S. Census Bureau." in www.prb.org/Datafinder/DatafinderSources.aspx
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