Hansen's disease vs mange

Hansen's disease

noun
  • The disease leprosy, caused by infection by Mycobacterium leprae. 

mange

noun
  • A skin disease of nonhuman mammals caused by parasitic mites (Sarcoptes spp., Demodecidae spp.). 

How often have the words Hansen's disease and mange occurred in a corpus of books? (source: Google Ngram Viewer )