them vs this one

them

pron
  • Used as the object of a preposition. 

  • Used as the direct object of a verb. 

  • Used as the indirect object of a verb. 

det
  • Those. 

this one

pron
  • A specified object, thing or person (especially one nearby or known). 

How often have the words them and this one occurred in a corpus of books? (source: Google Ngram Viewer )