FED vs sky blue

FED

noun

  • Field emission display. 

name

  • Federal Reserve System. Alternative spelling of Fed 

sky blue

noun

  • A vibrant light blue colour, like that of the sky on a fine day. 

adj

  • Of a vibrant light blue colour, like that of the sky on a fine day. 

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