PC vs politically correct

PC

verb
  • To make politically correct. 

noun
  • 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. 

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

politically correct

verb
  • To modify in a way that is more respectful to minorities. 

  • To modify in a way that conforms more to the official position of a government or political party. 

adj
  • Respectful of marginalized ethnic groups, genders, etc. 

  • Possessing or conforming to the correct political positions; following the official policies of the government or a political party. 

  • Stereotypically left-wing; possessing or conforming to stereotypical left-wing social views. 

  • Overly sensitive to giving offense on the grounds of race, sex, etc. 

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