Don Quixote vs wishful thinker

Don Quixote

noun

  • Any person or character who displays quixotism. 

name

  • A famous 1605–1615 Spanish novel by Miguel de Cervantes (1547–1616), whose full title is El ingenioso hidalgo don Quijote de la Mancha (The Ingenious Gentleman Don Quixote of La Mancha). 

  • The protagonist of this novel. 

wishful thinker

noun

  • One who engages in wishful thinking. 

How often have the words Don Quixote and wishful thinker occurred in a corpus of books? (source: Google Ngram Viewer )