Fractional Article Count in Select Group of Journals (Reflects percent of authors from each country per article)Nature Index, 2014
Weighted Fractional Article Count in Select Group of Journals (Reflects percent of authors from each country per article)Nature Index, 2014
Number of Patents U.S. Patent Office, 2013
Gross Domestic Expenditure on Research and Development billions of U.S. dollars, 2012*
Number of Science and Engineering PH.D.s Awarded thousands, 2007-2011