call to mind vs retrospect

call to mind

verb
  • To intentionally think about; to reflect upon. 

  • To cause to think about; to evoke. 

retrospect

verb
  • To look or refer back to; to reflect on. 

noun
  • Consideration of past times. 

How often have the words call to mind and retrospect occurred in a corpus of books? (source: Google Ngram Viewer )