doorman vs doorwoman

doorman

noun
  • A person who holds open the door at the entryway (entrance) to a building, summons taxicabs, and provides an element of security; in apartment buildings, he also accepts deliveries and may perform certain concierge type services. 

doorwoman

noun
  • The female equivalent of a doorman. 

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