larceny vs petty theft

larceny

noun
  • The unlawful taking of personal property as an attempt to deprive the legal owner of it permanently. 

  • A larcenous act attributable to an individual. 

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. 

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