oversupply vs surplusage

oversupply

noun
  • An excessive supply. 

verb
  • To supply more than is needed. 

surplusage

noun
  • A greater disbursement than the charge of the accountant amounts to. 

  • Matter in pleading which is not necessary or relevant to the case, and may be rejected. 

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