secret ballot vs yea

secret ballot

noun
  • The voting system involving ballots available only at official polling places, prepared at public expense, containing the names of all candidates, and marked in secret at the polling places. 

yea

noun
  • An affirmative vote, usually but not always spoken 

adv
  • Thus, so (now often accompanied by a hand gesture by way of measurement). 

intj
  • Yeah, right, yes. 

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