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Because the exact number of pages of a site was unknown, we did not know exactly what portion (i.what percent of pages) of the website was indexed. However, for any given site, we can compare the number of pages indexed by different search engines to know which engine covered a larger portion of the site.
We can extend this comparison from a single site to sites in a country. For a given country in Figures 5 to 8, the search engine that is located higher on the vertical axis covered a larger portion of the sites in that country.