VI vs sixer

VI

name

  • VI (“U.S. Virgin Islands”) 

noun

  • verb, intransitive. 

sixer

noun

  • A shot in which the ball passes over the boundary without touching the ground, for which the batting team is awarded 6 runs; a six. 

  • A prison sentence of six months 

  • A Cub Scout or Brownie who leads a group of six. Whence also Senior Sixer. 

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