The lowest value of SI appears to be for
k7 in Russia (0.05). The total number of papers in the sub-set of all
keywords x ¼ 1 to x ¼ 19 and other key variables in Equations
(1)e(3) are provided in the last two rows or last column in Table 4.
Between the years 2003 and 2014, the countries in the sample had
153,838 papers based on the given keywords.