of color vs pied

of color

adj
  • Nonwhite; of a race other than white, for example black. 

  • Belonging to a category of people with mixed black and white ancestry in the Americas in the 18th and early 19th centuries. 

pied

adj
  • Having two or more colors, especially black and white. 

  • Decorated or colored in blotches. 

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