comme il faut vs usual

comme il faut

adj
  • Proper; in keeping with etiquette or social standards. 

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 comme il faut and usual occurred in a corpus of books? (source: Google Ngram Viewer )