Complicated question, but I think organic, SEO, click through rates are down because of the public’s growing acceptance of ads at the top of the search engine. For years, there was proof of some people skipping the ads and going straight to the organic section. But my theory is that with Google loading the top with so many ads and pushing organic so far below, that consumers would rather give the ads a shot than scroll down to find the organic section. Thus making it even harder to make money off SEO.

Original Article:
http://www.wordstream.com/blog/ws/2017/04/26/google-ranking-click-through-rate