Metro Manila vs National Capital Region

Metro Manila

name
  • The major metropolitan area and the National Capital Region of the Philippines, centered around the city of Manila. 

National Capital Region

name
  • The seat of government and one of three defined metropolitan areas in the Philippines. 

  • The bi-provincial metropolitan region of the capital of Canada, Ottawa. 

How often have the words Metro Manila and National Capital Region occurred in a corpus of books? (source: Google Ngram Viewer )