dehancement vs depreciation

dehancement

noun
  • Deterioration, decline, reduction. 

depreciation

noun
  • The measurement of the decline in value of assets. Not to be confused with impairment, which is the measurement of the unplanned, extraordinary decline in value of assets. 

  • The decline in value of assets. 

  • The state of being depreciated; disparagement. 

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