mojo vs the black arts

mojo

noun
  • A telecopier; a fax machine. 

  • Any of various sauces originating in the Canary Islands and made with olive oil, peppers, garlic, paprika, and other spices. 

  • A magic charm or spell. 

  • Sex appeal; sex drive. 

  • Personal magnetism; charm. 

  • Supernatural skill or luck. 

  • Illegal drugs. 

the black arts

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