fairground vs jumble sale

fairground

noun
  • An area where a fair (an event for public entertainment) or other public event is held; a showground. 

  • A commercially-operated collection of rides, games and other entertainment attractions; an amusement park. 

jumble sale

noun
  • A sale of used goods by individuals operating tables or stalls, usually held indoors and open to the public. 

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