contraclockwise vs counter-clockwise

contraclockwise

adj

  • counterclockwise 

adv

  • counterclockwise 

counter-clockwise

adj

  • counterclockwise; anticlockwise 

adv

  • counterclockwise; anticlockwise 

How often have the words contraclockwise and counter-clockwise occurred in a corpus of books? (source: Google Ngram Viewer )