permanent marker vs sharpie

permanent marker

noun
  • a type of felt-tip pen used to create permanent water-resistant writing on a surface such as a writable DVD 

sharpie

noun
  • A Sharpie or other brand of felt-tipped marker pen. 

  • A knowledgeable fisherman. 

  • A member of a violent, fashionably dressed youth gang of the 1960s and 1970s. 

  • A swindler. 

  • A long, narrow fishing boat used in shallow waters. 

  • An alert person. 

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