nutty as a fruitcake vs stark raving mad

nutty as a fruitcake

adj

  • Behaving in an eccentric, foolish, or kooky manner; very nutty. 

stark raving mad

adj

  • Completely insane 

How often have the words nutty as a fruitcake and stark raving mad occurred in a corpus of books? (source: Google Ngram Viewer )