laissez-passer vs visa

laissez-passer

noun
  • A pass or permit; a document permitting the bearer to travel, sometimes issued as an emergency passport. 

visa

noun
  • A permit to enter and leave a country, normally issued by the authorities of the country to be visited. 

How often have the words laissez-passer and visa occurred in a corpus of books? (source: Google Ngram Viewer )