Did a quick google check on most books ever sold. Interesting list - no non-fiction and the best selling book was not written in English.
Fortunately for 2018, we do have some non-fiction. In fact mostly non-fiction. 2018 was definitely Year of #MeToo and Girl Power!
Haven't read Michelle Obama's autobiography, should be good! Meanwhile, just finished Shoe Dog by Phil Knights, founder of Nike. Amazing story, must read for investors!