chill out vs pitch a fit

chill out

verb
  • To relax or take time out; to calm down. 

pitch a fit

verb
  • To become angry, enraged, or upset; to act or react with an outburst, as by shouting, swearing, etc. 

How often have the words chill out and pitch a fit occurred in a corpus of books? (source: Google Ngram Viewer )