true to form vs usual

true to form

adv
  • According to one's nature; as expected. 

usual

noun
  • A specific good or service (e.g. a drink) that someone typically orders. 

  • The typical state of something, or something that is typical. 

adj
  • Most commonly occurring; typical. 

How often have the words true to form and usual occurred in a corpus of books? (source: Google Ngram Viewer )