The data above were extracted from the Essential Science
Indicators database of Clarivate. This database, currently
covering the period January 1999 through October 2008, surveys only journal
articles (original research reports and review articles) indexed by Thomson
Reuters. Here our ranking in all fields of the sciences and social sciences
is by papers produced. For articles with multiple authors from different
nations, each nation receives full, not fractional, publication credit.
Essential Science Indicators tabulated a total of 9,445,252
articles and reviews for the period indicated. The world percent figure is
calculated for each nation based on that total. The percent shares of these
top 20 nations sums to 102.8%, which reveals multinational coauthorship.
Essential Science Indicators surveys publication and citation data
over a decade, with bimonthly updates. To contrast the world share figures
for these nations for 1999-2008, Clarivate’s consulted its
National Science Indicators database, which covers the period
1981-2007, and checked the world share figures for these top 20 nations for
1989-1993. As the table above shows, the United States, Canada, and Russia
have lost world share, comparing 1989-1993 with 1999-2008, whereas China,
South Korea, Brazil, and Taiwan have increased their world shares of
science and social science papers dramatically.