beach chair vs folding chair

beach chair

noun
  • A special chair designed to provide comfort and protection from sun, wind, rain, and sand on beaches frequented by tourists. 

folding chair

noun
  • A light portable chair that can be stored in a stack, row or on a specially designed cart. They are produced in a variety of styles, folding mechanisms and materials. 

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