Bosjesman vs Bushman

Bosjesman

noun
  • A Bushman. 

Bushman

noun
  • A person who lives in the bush, especially a member of a community or ethnic group who lives in the bush. 

  • A member of one of the foraging ethnic groups native to southwestern Africa, mostly the Kalahari. 

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