Google Trends indicate declining interest in Search Engine Optimization
One reason interest has declined is Google is no longer actively marketing SEO and trying to gain market share. It already has made people believe that the only way to be on top of the SERP’s (Search Engine Results Page) is to pay for PPC (Pay Per Click) advertising.
If you click on the bars on the lower right side of the above map it shows a list of countries by interest. Vietnam, Bangladesh and India are the top 3 countries. One reason for this is most US based “SEO Agencies” outsource their link building to those countries for pennies on the dollar. These agencies make huge profits and the clients get generic links that actually can hurt their sites.