dogging vs mitching

dogging

noun
  • The act of one who dogs or harasses. 

  • The practice of having sexual intercourse in public places, especially parks, deliberately taking the chance of being watched. 

mitching

noun
  • Pilfering; skulking. 

  • Playing truant. 

  • A pretense of poverty. 

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