carnet vs counterfoil

carnet

noun
  • A ticket book, a collection of tickets in the form of a booklet often sold at a discount to single tickets. 

  • An admission pass. 

  • A customs document that allows the temporary duty-free importation of a particular article 

counterfoil

noun
  • the part of a cheque that is retained in the chequebook as a record; a stub 

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