Table 2. 
Number of universities among the top 25, 50, and 100 in the CWTS Leiden Ranking in periods 2006–2009 and 2014–2017 in the research field of “Physical sciences and engineering,” Ptop 1% indicator
Country/Set2006–20092014–2017
Top 25Top 50Top 100Top 25Top 50Top 100
USA 17 28 45 11 20 31 
UKNCH 4 8 17 5 7 11 
GFIS 0 3 10 0 0 4 
China 1 3 7 7 17 35 
Country/Set2006–20092014–2017
Top 25Top 50Top 100Top 25Top 50Top 100
USA 17 28 45 11 20 31 
UKNCH 4 8 17 5 7 11 
GFIS 0 3 10 0 0 4 
China 1 3 7 7 17 35 

UKNCH: the UK, Netherlands, and Switzerland; GFIS: Germany, France, Italy, and Spain. Source: https://www.leidenranking.com/ranking/2019/list, accessed May 22, 2019.

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