appreciate vs breadthen

appreciate

verb
  • To increase in value. 

  • To be grateful or thankful for. 

  • To view as valuable. 

  • To be fully conscious of; understand; be aware of; detect. 

breadthen

verb
  • To increase in breadth. 

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