Grecian vs belletristic

Grecian

noun
  • A senior pupil at Christ's Hospital School in West Sussex, England. 

belletristic

adj
  • Of, pertaining to, or having the characteristics of belles-lettres. 

  • Written or appreciated for aesthetic value rather than content 

How often have the words Grecian and belletristic occurred in a corpus of books? (source: Google Ngram Viewer )