Swan vs field day

Swan

noun
  • someone connected with Swansea City Football Club, as a fan, player, coach, etc. 

  • someone connected with the Sydney Swans, as a fan, player, coach, etc. 

name
  • A surname transferred from the nickname. 

field day

noun
  • A great time or a great deal to do, at somebody else's expense. 

  • A great time or a great deal to do; a period of bustling activity. 

  • A day of class taken away from school for a field trip. 

  • A day on which there is top-to-bottom all-hands cleaning. 

  • A school day for athletic events; a sports day. 

  • A day for manoeuvres and tactical exercises in "the field". 

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