petty theft vs shoplifting

petty theft

noun
  • A theft of property having a value lower than a certain small amount set forth in a statute, and considered to be a less serious class of crime. 

shoplifting

noun
  • A theft from a shop during trading hours. 

  • The action of stealing goods from a shop; the action of the verb shoplift. 

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