grandstand vs pat oneself on the back

grandstand

verb
  • To behave dramatically or showily to impress an audience or observers; to pander to a crowd. 

noun
  • The audience at a public event. 

  • The seating area at a stadium or arena; the bleachers. 

pat oneself on the back

How often have the words grandstand and pat oneself on the back occurred in a corpus of books? (source: Google Ngram Viewer )