Bacchanalian vs Dionysiac

Bacchanalian

adj
  • Of or pertaining to the festival of Bacchus; relating to or given to reveling and drunkenness. 

noun
  • A bacchanal; a drunken reveler. 

Dionysiac

adj
  • Of, or relating to Dionysus or to the Dionysia. 

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