commissioning vs enrollment

commissioning

noun
  • The process of assuring that all systems and components of a major piece of equipment, a process, a building or similar are designed, installed and tested according to the operational requirements of the owner or final client. 

enrollment

noun
  • The number of people enrolled. 

  • The act of enrolling or the state of being enrolled. 

  • The record of such enrolling; registration. 

  • The people enrolled, considered as a group. 

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