expiry date vs maturity

expiry date

noun
  • The date on which something runs out or expires and becomes out of date, in many cases needing renewal. 

maturity

noun
  • Date when payment is due. 

  • The state of being mature, ready or ripe. prime state of productibility and self expression. 

  • When bodily growth has completed and/or reproduction can begin. 

  • The state of a debt obligation at the end of the term of maturation thereof, once all interest and any applicable fees have accrued to the principal. 

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