Romani vs tzigane

Romani

noun
  • A member of the Roma, a nomadic people with origins in India. 

name
  • The Indo-Aryan lect of the Roma people, or one of its sublects (such as Roma, Sinti, Romanichal, etc), closely related to Hindi and Rajasthani. 

adj
  • Of or belonging to the Roma people. 

tzigane

noun
  • A Hungarian Gypsy (Romani person). 

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