few cards shy of a full deck vs lunatic

few cards shy of a full deck

adj

  • mentally deranged; demented; insane. 

lunatic

adj

  • Crazed, mad, insane, demented. 

noun

  • An insane person. 

How often have the words few cards shy of a full deck and lunatic occurred in a corpus of books? (source: Google Ngram Viewer )