Canadian football vs footy

Canadian football

noun
  • A game similar to American football played on a field of 110 yards long and 65 yards wide (with two 20 yard-long endzones) in which two teams of 12 players attempt to get an ovoid ball to the end of each other's territory. 

footy

noun
  • The ball used in a game of footy. 

  • A football fan. 

  • Football (association football) (soccer in US, Canada, Australia, New Zealand) 

  • The game or sport of football, usually Australian rules football or rugby league, but not soccer 

  • A short sock. 

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