guernsey vs jersey

guernsey

noun
  • The shirt worn by the players. 

  • A seaman's knitted woolen sweater, similar to a jersey. 

  • (slang: as in "get a guernsey") [receive] praise, admiration, recognition, credit, etc 

jersey

noun
  • A shirt worn by a member of an athletic team, usually oversized, typically depicting the athlete's name and team number as well as the team's logotype. 

  • A garment knitted from wool, worn over the upper body. 

  • A type of fabric knit 

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