Subcontinent vs subcontinent

Subcontinent

subcontinent

name
  • The Indian subcontinent, South Asia. 

noun
  • A large landmass which is either smaller than a continent (such as Greenland), or part of an even larger continent (such as the Indian subcontinent). 

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