PC vs policeman

PC

noun
  • forty-nine (an allusion to a cartoon character, Police Constable 49) 

  • A member of the Conservative Party of Canada. 

  • A personal computer, especially one similar to an IBM PC that runs Microsoft Windows (or, originally, DOS), usually as opposed to (say) an Apple Mac. 

verb
  • To make politically correct. 

policeman

noun
  • A male police officer, sometimes used for any police officer regardless of gender. 

  • Any skipper of the genus Coeliades. 

  • A glass rod capped at one end with rubber, used in a chemistry laboratory for gravimetric analysis. 

  • Synonym of enforcer 

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