petty larceny vs petty theft

petty larceny

noun
  • A misdemeanor larceny; an act of theft wherein the amount stolen is insufficient to constitute grand larceny. 

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 petty larceny and petty theft occurred in a corpus of books? (source: Google Ngram Viewer )