outback vs wide open space

outback

adj
  • Characteristic of the most remote and desolate areas of Australia; very remote from urban areas. 

verb
  • To travel or stay in the outback 

adv
  • To or towards the most remote and desolate areas of Australia. 

noun
  • The most remote and desolate areas of Australia; the desert and areas too arid for growing crops. 

wide open space

How often have the words outback and wide open space occurred in a corpus of books? (source: Google Ngram Viewer )