add insult to injury vs madden

add insult to injury

verb
  • To further a loss with mockery or indignity; to worsen an already unfavourable situation. 

madden

verb
  • To make angry. 

  • To make insane; to inflame with passion. 

How often have the words add insult to injury and madden occurred in a corpus of books? (source: Google Ngram Viewer )