Borstal vs Stock

Borstal

name
  • A suburb, formerly a village, in Rochester, Medway borough, Kent, England (OS grid ref TQ7366). 

Stock

name
  • A village and civil parish in Chelmsford district, Essex, England (OS grid ref TQ6998). 

  • A surname. 

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