Shetland lace vs openwork

Shetland lace

noun
  • An openwork ornamental trimming made with woolen yarn for shawls, etc. 

openwork

noun
  • A quarry; an open cut. 

  • Any of several forms of metalwork or needlework having decorative openings. 

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