Demotic Greek vs purist Greek

Demotic Greek

noun

The Modern Greek vernacular language. It became the official Modern Greek in 1976 when Katharevousa was replaced, and was written in polytonic script until 1982, and in monotonic script after 1982.

purist Greek

noun

Greek which is used in an archaistically, recalling one which is of a historical, Ancient or Classical style.

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