Bozo vs chimpanzee

Bozo

noun
  • A member of a West African ethnic group located predominantly along the Niger River in Mali, famous for their fishing. 

name
  • The Mande language of these people. 

chimpanzee

noun
  • A member of the genus Pan, including the bonobo which is also known as the pygmy chimpanzee. 

  • Pan troglodytes, a species of great ape in the genus Pan, native to Africa, and believed by biologists to be the closest extant relative to humans along with the bonobo. 

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