Irish Traveller vs pikey

Irish Traveller

noun
  • A member of a particular nomadic ethnic minority in Ireland, the Pavee. 

pikey

noun
  • An itinerant person, especially one of Romani or Irish Traveller heritage. 

  • A pike (fish). 

  • A working-class (often underclass) person with negative connotations of benefit fraud, theft and living on rundown estates. 

verb
  • To steal. 

adj
  • Associated with members of the above-mentioned underclass. 

  • Associated with or filled with pike (fish). 

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