Gypsy vs tzigane

Gypsy

noun
  • A member of other nomadic peoples, not only of the Romani people; a traveller. Alternative spelling of gypsy 

  • A member of the Romani people, or one of the sub-groups (Roma, Sinti, Romanichal, etc). 

name
  • The language Romani. 

  • A female given name. 

adj
  • Of or belonging to the Romani people or one of it sub-groups (Roma, Sinti, Romanichel, etc). 

tzigane

noun
  • A Hungarian Gypsy (Romani person). 

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