introduction agency vs matchmaker

introduction agency

noun
  • A company which arranges dates and marriages between men and women, often from different countries. 

matchmaker

noun
  • Someone who finds suitable dates or marriage partners for other people. 

  • Someone who arranges professional boxing matches. 

  • Someone who makes matchsticks. 

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