QPF vs SQ

QPF

noun

  • SQ — Quebec police force — Sûreté du Québec 

SQ

noun

  • subcutaneous injection 

name

  • Sûreté du Québec - the Quebec provincial police force 

adj

  • subcutaneous 

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