emigration vs exiting

emigration

noun
  • The act of emigrating; movement of a person or persons out of a country or national region, for the purpose of permanent relocation of residence. 

  • A body of emigrants; emigrants collectively. 

exiting

noun
  • The act of one who exits; a departure. 

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