bakkie vs big rig

bakkie

noun
  • A small pick-up truck or ute, generally open and sometimes fitted with a removable canopy, but distinct from an enclosed van and a large truck. 

  • A small bowl or container, sometimes with a cover such as a Tupperware container. 

big rig

noun
  • A large truck, an 18-wheeler. 

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