FUBAR vs knackered

FUBAR

adj
  • Fucked up (or, bowdlerized, fouled up) beyond all recognition (or beyond all repair, or beyond all reason, or beyond any recovery). 

knackered

adj
  • Broken, inoperative. 

  • Tired or exhausted. 

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