mzungu vs white man

mzungu

noun
  • A white person. 

white man

noun
  • white people collectively; white culture. 

  • Used other than figuratively or idiomatically: see white, man. 

  • A Caucasian man; a man of northern European descent or having that appearance. 

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