PM vs autopsy

PM

verb
  • To project manage. 

  • To send a private message to (a participant in a chat room, etc.). 

autopsy

verb
  • To perform an autopsy on. 

  • To perform an after-the-fact analysis of, especially of a failure. 

noun
  • An after-the-fact examination, especially of the causes of a failure. 

  • An eyewitness observation, the presentation of an event as witnessed. 

  • A dissection performed on a cadaver to find possible cause(s) of death. 

How often have the words PM and autopsy occurred in a corpus of books? (source: Google Ngram Viewer )