rep vs sales representative

rep

noun
  • A fabric made of silk or wool, or of silk and wool, and having a transversely corded or ribbed surface. 

verb
  • To represent; to act as a representative for. 

  • to lift for multiple reps 

sales representative

noun
  • A sales assistant representing the company outside the place of business. 

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