kooky vs round the bend

kooky

adj
  • Eccentric, strange, or foolish; crazy or insane; kookish. 

  • Behaving like a kook (a person with poor style or skill); kook-like. 

round the bend

prep
  • Crazy, mad or insane. 

  • Close to or in close proximity to another location. 

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