pickpocket vs purloin

pickpocket

verb
  • To pick pockets; to steal. 

noun
  • One who steals from the pocket of a passerby, usually by sleight of hand. 

purloin

verb
  • To commit theft; to thieve. 

  • To take the property of another, often in breach of trust; to appropriate wrongfully; to steal. 

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