decima vs tithing

decima

noun
  • A tithe or tax of one-tenth (now usually in historical Italian contexts). 

  • A 10-line verse or stanza, (chiefly) in the form of a song comprising an introductory verse followed by four such divisions. 

  • An organ stop a tenth above the normal 8-foot pitch. 

tithing

noun
  • The payment of tithes. 

  • A part of the hundred as a rural division of territory. 

  • The collection of tithes. 

  • Ten sheaves of wheat (originally set up as such for the tithe-proctor). 

  • The tithe given as an offering to the church. 

  • A body of households (originally a tenth of a hundred or ten households) bound by frankpledge to collective responsibility and punishment for each other's behavior. 

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