ARMY vs midnight blue

ARMY

noun

  • An individual fan of the K-pop boy band BTS. 

  • The fandom of the K-pop boy band BTS. 

midnight blue

noun

  • a dark blue colour, almost black. 

adj

  • of a dark blue colour, almost black. 

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