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== Visual Numerical and visual data == === Google Scholar === The following table summarizes per-year mentions on Google Scholar as of October 26, 2021. {| class="sortable wikitable"! Year! "search engine optimization"|-| 2000 || 28|-| 2002 || 61 |-| 2004 || 145 |-| 2006 || 442|-| 2008 || 948|-| 2010 || 1,850 |-| 2012 || 2,830|-| 2014 || 3,240|-| 2016 || 3,770|-| 2018 || 4,660 |-| 2020 || 5,340|-|} [[File:xxx|thumb|center|700px]]
=== Google Trends ===
