disimprovement vs retrenchment

disimprovement

noun
  • Reduction from a better to a worse state. 

  • attempt to make something better while ending up worse than before. 

retrenchment

noun
  • A curtailment or reduction. 

  • An act of reducing expenses; economizing. 

  • An act of terminating the employment of a worker or making an employee redundant, often to reduce expenses; a layoff. 

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