trad vs traditional climbing

trad

noun
  • traditional climbing. 

  • Irish traditional music 

  • A traditionalist. 

  • Anything traditional, such as a school or a model of car. 

adj
  • traditional 

traditional climbing

noun
  • A style of rock climbing in which the climbers place all gear required to protect against falls, and remove it when a passage is complete. 

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