Table 2. 

International collaboration for United States in high-impact research (2009–2018)

YearTotal publicationsPublications with ChinaPercentageRank of China
2018 34,043 5,339 15.683 1 
2017 33,671 4,736 14.066 1 
2016 33,642 4,082 12.134 1 
2015 37,836 3,841 10.152 1 
2014 37,042 3,413 9.214 1 
2013 36,077 2,959 8.202 2 
2012 37,753 2,743 7.266 2 
2011 36,429 2,178 5.979 3 
2010 32,823 1,764 5.374 4 
2009 36,182 1,516 4.19 4 
YearTotal publicationsPublications with ChinaPercentageRank of China
2018 34,043 5,339 15.683 1 
2017 33,671 4,736 14.066 1 
2016 33,642 4,082 12.134 1 
2015 37,836 3,841 10.152 1 
2014 37,042 3,413 9.214 1 
2013 36,077 2,959 8.202 2 
2012 37,753 2,743 7.266 2 
2011 36,429 2,178 5.979 3 
2010 32,823 1,764 5.374 4 
2009 36,182 1,516 4.19 4 
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