cleanliness vs personal hygiene

cleanliness

noun
  • The property of being cleanly, or habitually clean; good hygiene. 

  • Ritual purity. 

personal hygiene

noun
  • The hygienic measures concerning a person's bodily condition, notably external cleanliness. 

How often have the words cleanliness and personal hygiene occurred in a corpus of books? (source: Google Ngram Viewer )