drive-in movie vs silver screen

drive-in movie

noun
  • A type of cinema where people watch films on a large public outdoor screen from their automobiles 

silver screen

noun
  • A cinema screen onto which movies are projected. 

  • By extension, movies, or that which is related to movies or cinema. 

How often have the words drive-in movie and silver screen occurred in a corpus of books? (source: Google Ngram Viewer )