D/L vs upload

D/L

noun
  • download 

  • Duckworth-Lewis method 

prefix
  • dextro-/levo- (used as a prefix to describe racemic mixtures) 

verb
  • download 

upload

noun
  • Such a file transfer. 

verb
  • To transfer data to a computer on a network, especially to a server on the Internet. 

How often have the words D/L and upload occurred in a corpus of books? (source: Google Ngram Viewer )