curricle vs sulky

curricle

noun
  • A light two-wheeled carriage large enough for the driver and a passenger and drawn by a carefully-matched pair. 

sulky

noun
  • A low two-wheeled cart, used in harness racing. 

  • Any carriage seating only the driver. 

adj
  • silent and withdrawn after being upset 

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