bank holiday vs national holiday

bank holiday

noun
  • A weekday, often a Monday, on which most businesses are closed, and granted to workers as a national holiday. 

  • A closure of banks in a jurisdiction to curtail or prevent a bank run. 

national holiday

noun
  • A statutory holiday enacted by a country to commemorate the country itself. 

  • A public holiday. 

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