Observant vs Observantine

Observant

noun
  • A member of a Franciscan order that strictly observes the rules of St. Francis. 

Observantine

noun
  • A member of the Observant branch of Franciscan friars. 

adj
  • Of or pertaining to the Observant branch of Franciscan friars 

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