carry forward vs carry over

carry forward

verb
  • To transfer to a new page, column, ledger, or similar entity. 

  • To apply to the taxable income of following years, thereby easing the overall tax burden; carry over. 

carry over

verb
  • To transfer. 

  • To induce to join an opposing party or faction. 

  • To carry; to transfer an excess quantity to the next column of digits. 

  • Used other than figuratively or idiomatically: see carry, over. 

  • To transfer (something) to a later point in time. 

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