Swan vs dim bulb

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. 

dim bulb

noun

  • A person who is slow-witted or stupid. 

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